Mac book pro keyboard acting as Option + Shift are constantly pressed

Hi guys,
My MBP keyboard is acting as if Option Shift are constantly being pressed. For example, pressing on letters brings up special characters (pressing k will bring up ). I have tried disabling all the modifier keys in "System Preferences", but the result is still the same. I have also tried installing all updates on my OS (Mavericks).  The onscreen keyboard acts in the same manner as the physical keyboard, but an external USB keyboard was working as expected.
Thanks in advance for your help.

I have similar issue: both left and right shift keys time to time being pressed, it disappears after a while...but once I couldn't log in as the shift option puts caps lock on....really annoying.
The only reason in my case is the keyboard cleaning that I have done recently...
There is no quick fix for this I am afraid.
Options:
1.Apple replaces the keyboard you pay around £200 I think....
2. Buy new keyboard on Ebay and replace it yourself £40....
http://www.ifixit.com/Guide/MacBook+Pro+13-Inch+Unibody+Mid+2010+Keyboard+Replac ement/23632#s61162
Anyway lets see.

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