Strips of missing/remapped pixels

Hi Folks,

I have a MacBook Pro (15-inch, Mid 2010), the model with two graphics cards. I updated my OS to 10.10 about two months ago. When I first installed the update, I had a vertical strip of pixels on my display which were discolored and distorted. The problem progressed to the pixels in the strip constantly flickering. I did the standard SMC reset, etc., but nothing helped. Luckily, the problem went away after a few days on its own. Now, (about a month later) the issue has reappeared, minus the flickering (at least for now). See the attached picture. The issue seems like its purely a graphics problem.

My macbook has the following graphics cards:
NVIDIA GeForce GT 330M graphics processor
Intel HD Graphics with 256MB

I'd appreciate if someone can help me resolve this issue. Thanks.