If you haven't run a few rolls through the Fleenor camera since it came back, I wouldn't take it on a trip.
This has nothing to do with Fleenor. Mechanical devices are imperfect, humans are imperfect, sometimes the best make mistakes or miss something. I had two 35mm Pentax SLRs worked on by one of the best. He missed a failing shutter block on one and a flash sync/shutter curtain problem on the other. You can find threads on forums of this guy fixing hundreds of cameras perfectly. But my luck to get two he missed on (and he made good on both mistakes, quickly and smoothly, and I'd use him again).
Until I've shaken out a camera on a few rolls, I don't trust them.