my MBP was having kernel panic very often because of the Nvidia driver. I brought it to the apple store and check for the TS4088 problem. At first they said that my problem was because of that and they would fix it for free, but several days later they called me and said that they found custom RAM upgrade in my laptop and they thought it was because of that so I have to pay for the repair. I am sure it isn't because of the RAM because the kernel panic happened before I upgraded my RAM, but they just refused to fix that for me. My question is: Is it possible for me to put the original RAM back in and bring that to Apple Store again and do the TS4088 test? And is the TS4088 problem really because of my RAM?