Wiring?
I bought my '89 last year and love it. I haven't had this problem myself, but in researching my purchase, I encountered a few owners who had needed to rewire. I don't know the details of their problems, and I don't have any reason to think the incidence is out of line, given the 1000s of C30s out there, but you may want to ask your surveyor to take a particularly close look at the wiring.Generally, if your rigging (standing or running) is original, its getting pretty old, so you'll want to try to get a good idea of how much you are likely spend updating it.Good luck!