Not enough information to give any answer. It can be something trivial, as well as something beyond economical repair. Of course everything can be repaired/rebuild. Some chips may be hard to find, especially now, when borders are closed (and will likely stay closed for next year). Some of these chips have GAL/CPLD replacements. Freddy and Sally are quite easy to replace with available parts, Antic and GTIA seem to be relatively easy to get, hardest to find are PIA and Pokey (yet Pokey recently got a modern replacement - POKEY MAX).