Finally got a 0102 too,. my xbox started freezing randomly 1 day ago, suddenly then the three red lights.
I have had no metal foil under my cooling units, but anyhow I put some Arctic Silver on it.
I read a post about moisture that had build up on the mainboard, so I disassembled my box again and suddenly noticed these odd marks on the mainboard. First I thought they were caused by heat and burned in, but then I tried to wipe them away and with a little force I had success.
It'll take a while till I'm totally done, but hopefully this helps me with my 3-RedLights...
Maybe these pics can help to find out what the reason for a 0102 is. I think the 0102 can have different reasons as it may be some sort of general failure, which would it make really hard to fix these errors... :/
I'll post as soon as I completley wiped the mainboard and tested the box again...