Can't boot into windows 7 partition after updating to 10.10.3. [MBP-mid 2014]

Storage still shows windows partition but when I long press the option key when the laptop is turned on, it doesn't show the windows partition.

Loner T - I can see that your analysis/advice is working. I have the same problem. Below is my info based on your recommended data collection. What do you suggest? Thanks a lot.
Valys-iMac:~ ValyiMac$ diskutil list
/dev/disk0
   #: TYPE NAME SIZE IDENTIFIER
   0:      GUID_partition_scheme *121.3 GB   disk0
   1: EFI EFI 209.7 MB   disk0s1
   2: Apple_CoreStorage 121.0 GB   disk0s2
   3: Apple_Boot Boot OS X 134.2 MB   disk0s3
/dev/disk1
   #: TYPE NAME SIZE IDENTIFIER
   0:      GUID_partition_scheme *1.0 TB disk1
   1: EFI EFI 209.7 MB   disk1s1
   2: Apple_CoreStorage 874.3 GB   disk1s2
   3: Apple_Boot Recovery HD 650.1 MB   disk1s3
   4:       Microsoft Basic Data BOOTCAMP 125.0 GB   disk1s4
/dev/disk2
   #: TYPE NAME SIZE IDENTIFIER
   0: Apple_HFS Macintosh HD           *989.5 GB   disk2
Logical Volume on disk0s2, disk1s2
DFAC90B9-F541-4F75-9E2C-072EC0033DEC
Unencrypted Fusion Drive
/dev/disk3
   #:                       TYPE NAME SIZE IDENTIFIER
   0:     FDisk_partition_scheme *2.0 TB disk3
   1: Windows_NTFS My Passport 2.0 TB disk3s1
Valys-iMac:~ ValyiMac$ diskutil cs list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group ACDAD8FF-B29A-4665-A986-1A011896C5E5
=========================================================
    Name: Macintosh HD
    Status:       Online
    Size: 995333775360 B (995.3 GB)
    Free Space:   0 B (0 B)
    |
    +-< Physical Volume 53129116-6E86-4D5D-B32F-53EBAF9C32BE
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk0s2
    |   Status: Online
    |   Size:     120988852224 B (121.0 GB)
    |
    +-< Physical Volume 86BB9974-F6CF-41DA-9E25-ABB0EC7BCA95
    |   ----------------------------------------------------
    |   Index:    1
    |   Disk:     disk1s2
    |   Status: Online
    |   Size:     874344923136 B (874.3 GB)
    |
    +-> Logical Volume Family 4E639C42-7A43-4B39-ABB9-02F3CFBB5DCB
Encryption Status:       Unlocked
Encryption Type:         None
Conversion Status:       NoConversion
Conversion Direction: -none-
        Has Encrypted Extents:   No
Fully Secure: No
Passphrase Required:     No
        |
+-> Logical Volume DFAC90B9-F541-4F75-9E2C-072EC0033DEC
Disk: disk2
Status: Online
Size (Total):          989478518784 B (989.5 GB)
Conversion Progress: -none-
Revertible: No
LV Name: Macintosh HD
Volume Name: Macintosh HD
Content Hint:          Apple_HFS
Valys-iMac:~ ValyiMac$ sudo gpt -vv -r show /dev/disk0
WARNING: Improper use of the sudo command could lead to data loss
or the deletion of important system files. Please double-check your
typing when using sudo. Type "man sudo" for more information.
To proceed, enter your password, or type Ctrl-C to abort.
Password:
gpt show: /dev/disk0: mediasize=121332826112; sectorsize=512; blocks=236978176
gpt show: /dev/disk0: PMBR at sector 0
gpt show: /dev/disk0: Pri GPT at sector 1
gpt show: /dev/disk0: Sec GPT at sector 236978175
      start       size  index  contents
          0          1 PMBR
          1          1 Pri GPT header
          2 32 Pri GPT table
34          6
40 409600 1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
     409640  236306352      2  GPT part - 53746F72-6167-11AA-AA11-00306543ECAC
  236715992     262144      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
  236978136          7
  236978143         32 Sec GPT table
  236978175          1 Sec GPT header
Valys-iMac:~ ValyiMac$ sudo fdisk /dev/disk0
Disk: /dev/disk0     geometry: 14751/255/63 [236978176 sectors]
Signature: 0xAA55
Starting       Ending
#: id  cyl  hd sec -  cyl  hd sec [     start -       size]
1: EE 1023 254  63 - 1023 254 63 [         1 -  236978175] <Unknown ID>
2: 00    0 0   0 -    0   0   0 [         0 -          0] unused     
3: 00    0 0   0 -    0   0   0 [         0 -          0] unused     
4: 00    0 0   0 -    0   0   0 [         0 -          0] unused     

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               0           1         MBR
               1           1         Pri GPT header
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              34           6        
              40      409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
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      1701688456     1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
      1702957992     1846360        
      1704804352   248002560      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
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    kevinature wrote:
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