Also still looking for these.
This is what I found after a google and it seems to be exactly what I was experiencing on my 3000.
"U202/203: Chips That Overheat
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Many A3000 owners complain of strange graphics and disk errors,
like windows and gadgets being trashed. Sometimes dots and horizontal
lines will appear. This is likely due to the U202 and U203 components,
a pair of Programmable Array Logic chips (format: 16L8-10) which tend to
overheat."
