Not so much a problem with the chip but oxidation of its many legs within the socket. I've only ever seen one CC3 with a dead GIME chip, though I do get CC3s come through my workshops every couple of years and all I need to do is prize out the Gime, clean its legs with rubbing alcohol and re-inset, the computer fires up and works fine.
A heat sink on the Gime chip might help, and some CC3s have it and some don't.
I put in an order for the computer for $160. No game carts. No joysticks. No mouse. Soon to come video cable for Amiga 1080 monitor, floppy drives, Nitros9, additional memory and 6309 CPU. Comments on programs for same?