<html> Patrick,   The book by Arthur Reblitz is a good one to have around if you're going to tackle vacuum roll players. It's difficult to stay "on the fringes" without a fair knowledge of the system concepts. The roll motor, governor, tracker alignment pneumatics, and the various valves all need service more often than the "big" stuff. If you need a rebuild, you'll need to know how to set everything up after you ship out the stack for the easy part. Guy Nichols, RPT former player and reproducer worm orgy decoder. At 05:22 PM 7/23/2003 -0700, you wrote: <blockquote type=cite class=cite cite>Hello all: I got a request to come out and look at a player piano that suddenly stopped rewinding. As there are no longer any active player technicians in my area, I occasionally try to help out with (hopefully) minor problems. It would help if I could find an online source for diagnosing and repairing these things. Major rebuilding of player pianos is not something I want to  pursue, but it would be nice to help some keep their beloved player running, at least for a while. Thanks, Patrick C. Poulson Registered Piano Technician Piano Technicians Guild</blockquote></html>