TTX Monitor Problem

Question

Hi, I have a TTX-8765 (model TE767B) that works perfectly except for a small problem with the picture. It seems to compress / expand by a few pixels (mainly on the left side) and the reslut is an unstable picture. I was wondering if any of you had ever experienced this problem and point me in the right direction. I'm not a monitor expert but can still give a go at it. Thanks