Hey Bob, Bob here, I can't shed light first hand with regards to the centerboard other than I have heard the cable that moves it does get jammed, there may be an easy fix, hopefully you will get more insight on that. I purchased a the same(1984 nodel) last December with a shoal draft keel. I have had very few issues,seems to sail fast and feels solid. as far as spare parts, it seems slim pick'ns. Good luck!
I also am interested in a 34'-35' citation ('84-'88 models). Is there anything you could tell me about these boats (pros and cons). I am hearing that these boats are prone to leak... do you find this true? Thanks for any info!