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U12 and U13 buffer and latch some of the memory lines So if there is an issue with them then the common symptom is a green screen What you'll probably find is the traces underneath these chips are damaged/broken.
What I would do:
Clean the area with white vinegar to neutralize any remaining battery liquid then wipe down with IPA
Remove Gary, and clean the legs.
Replace the Gary socket, it's probably corroded so much it's useless.
Remove U12 and U13, the chips are probably fine and will work if you give the legs a good clean. Check the area under these chips, this is where the memory data lines go and this is where I find battery damage happens most often in a 500+, the lines go under these two chips and are usually the first to break. bBeak out a multimeter and use the continuity tester to check the lines. Best to fit sockets in there place.
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