Macbook Pro Retina fan runs constantly

Hi,
I have a mid 2012 15 inch Retina Macbook Pro that was running absolutely fine till last 2 years. Just recently it is creating problem like the fans of the laptop run constantly even under normal cpu load and temperature. I have tried every possible guide and way to fix it but just couldn't solve it.
Then I ran the hardware test and found out the following error:
4SNS / 1 / 40000000 : Th2H - 127.875
After little bit of googling, I found out the error code referred to sensor related problems. Important to mention here, I live in Bangladesh where apple does not have a direct store but 1 - 2 authorised retailers and service providers. So I took my laptop to one of the authorised service providers w/o any delay and they told me I have to change my logic board as there's no other way to fix it. And changing the logic board will cost me hefty usd 1200 approximately which is a lot for me.
So can anyone suggest me what to do now. Is the error code really refers to replacing my logic board? Is there any way to skip the replacement? I mean is there any way to control fan by any app? What best I can do now?
I will highly appreciate if anyone gives me an honest opinion.
Thanks.

Not sure of the feasibility of this, but one potentially cheaper option would be to buy a matching model from Ebay that has a non-logic board related fault (screen, physical damage, etc.) that can be bought cheap and the logic board transplanted to your own. At $1200 you are clearly in the "buy a new one" category. You would have to consider things like whether the MPB is registered (and potentially locked) like iOS devices can be. Not sure if the same security applies to Macs?
If replacement is your only option, then you should still be able to sell your current MBP on Ebay for parts.
Perhaps contact Apple direct and see if you can arrange a direct repair with them? I am assuming you didn't purchase the Applecare cover (which if only 2 years old would still cover your MPB).

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0      kernel_task               root       5.9      200.7 MB        2.39 GB
1      launchd                   root       0.0      1.3 MB          2.36 GB
10     kextd                     root       0.0      5.5 MB          2.36 GB
11     DirectoryService          root       0.0      5.5 MB          2.36 GB
12     notifyd                   root       0.0      640 KB          2.34 GB
13     syslogd                   root       0.0      768 KB          2.36 GB
14     configd                   root       0.0      3.5 MB          2.38 GB
15     blued                     root       0.0      4.5 MB          2.36 GB
16     diskarbitrationd          root       0.0      1.6 MB          2.35 GB
17     distnoted                 daemon     0.0      1.4 MB          2.35 GB
18     mDNSResponder             _mdnsrespo 0.0      2.4 MB          2.36 GB
23     securityd                 root       0.0      2.7 MB          2.36 GB
26     ntpd                      root       0.0      1.1 MB          2.32 GB
27     krb5kdc                   root       0.0      2.0 MB          2.35 GB
31     usbmuxd                   _usbmuxd   0.0      2.1 MB          2.36 GB
32     SystemStarter             root       0.0      1.0 MB          2.35 GB
36     RFBRegisterMDNS           root       0.0      1.8 MB          2.33 GB
38     mds                       root       0.1      35.5 MB         2.55 GB
39     loginwindow               Lease      0.0      7.9 MB          2.63 GB
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42     hidd                      root       1.4      1.6 MB          2.35 GB
43     fseventsd                 root       0.0      2.0 MB          2.36 GB
45     dynamic_pager             root       0.0      796 KB          2.32 GB
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110    fontd                     Lease      0.0      7.2 MB          2.40 GB
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131    imagent                   Lease      0.0      14.6 MB         2.63 GB
139    Apple80211Agent           Lease      0.0      13.1 MB         10.69 GB
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141    AppleVNCServer            Lease      0.0      3.8 MB          2.60 GB
150    Safari                    Lease      0.0      94.6 MB         3.78 GB
152    Safari Web Content        Lease      0.3      187.5 MB        3.82 GB
163    mdworker                  Lease      0.0      11.8 MB         2.38 GB
184    cvmsComp_x86_64           Lease      0.0      6.0 MB          2.34 GB
188    Activity Monitor          Lease      5.6      28.9 MB         2.76 GB
190    activitymonitord          root       0.6      1.3 MB          2.33 GB
191    Quick Look Helper         Lease      0.0      76.1 MB         3.98 GB
194    cvmsComp_i386             Lease      0.0      2.8 MB          599.1 MB
196    ocspd                     root       0.0      1.4 MB          2.34 GB
199    SpotifyWebHelper          Lease      0.0      2.2 MB          873.6 MB
203    SFLIconTool               Lease      0.0      1.1 MB          2.33 GB

Hello, LeaseBL.
Thank you for visiting Apple Support Communities.
Try resetting the System Management Control to see if the fan noise ceases. Also, make sure there are no obstructions to the fan as well as the portable is on a flat surface when in use.
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
Cheers,
Jason H.

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