apart mechanical failures that are most likely result of impacts, there is not much that can go wrong in a slideride. pots of course will wear with time but are relatively easy to replace. the whole board will have to be replaced, but is cheap, and an easy job for any hobbyist, no soldering or special tools required.
i have seen a case of a worn out pot, but red dot was still usable
there are chinese knockoffs floating around that are very cheap and can be used as source of spare parts.