Yep, cleaning it off and then trying to stabilize the acid creep with some vinegar & baking soda would be good. Then, using a DMM, buzz out (some people call it that) the traces and check for continuity that may need to be repaired.
Stupid question, but... are you certain the 68000 CPU is installed? The 2630 might not need it (other accelerator cards do not), so perhaps someone pulled it for something else some time ago? Just a shot in the dark.
