Heavy Sixer color problems ?

OK fist i wasnt sure if this was the correct forum :S sorry if not

Second i got a Heavy sixer recently it came with 58 cart only games paid 25$
claimed it worked well..

Cleaned it....

Hooked it up...

Poped a game in and fired it up....

It works.... Kinda...

I noticed the colors where wrong..

Simple fix i thought.. Grabbed Pitfall and adjusted the color pot untill it was right..

Well while playing i noticed it would jump from the green pitfall background to a bright blue, then very little color... almost B&W

I though aha this is fixable.. changed the Color pot, R212? and R213? dont quote me on those resisters i cant remember exaclty what #'s they where..

Almost fixed!!!

Still getting the green bleeding into bright blue...

IS THIS THE TIA CHIP GOING BAD???

Any help would rock!

Thanks!