Just picked up a RCT yesterday and joined the club! Lamp matrix was not functional when I picked it up. I replaced the blown F22 fuse before loading it up and most lamps now light two other lamps (usually same column) in single lamp test mode. I'm guessing bad diode(s) somewhere and or short(s). I had a 7 hour drive home ahead of me, so I'll troubleshoot more when I get it set up at home. Other than the lamp matrix issues and a pop bumper not working, the overall condition was much better than I was expecting. The seller was very nice and helpful and I believe he wasn't aware of the issue, so I didn't dicker.
I haven't played RCT much and it's been years since the last time. My old rating wasn't great so it will be interesting to see how I like it once I get it tuned up and get some serious time on it. It will eventually go next to my other Lawlor pin with a creepy hairy head, Ripley's Believe it or Not (which is a great game).
Update: The right ramp is also cracked on the left side (piece missing). I guess I'll be picking up some Cliffy protectors as well.
Update 2 (10 hours later): I guess I was distracted by the lamp problem and didn't notice there was also a switch problem with an entire non-functional column (switches 33-40). At least that points to a column drive transistor and indeed transistor Q5 ohms out bad. I doubt this is related to my lamp problem and hopefully the transistor just needs replaced and is not just some symptom of another problem.