I used to send my tape VariCam in annually for a 'clean & check' and there was usually at least something minor done to the tape deck, even if just as simple as a cleaning or replace the pinch rollers. I don't think I've ever had to have my P2 Vari's, C300 or F55 in to service for maintenance/repair issues. I wish I could say the same for all of my ENG lenses. I have one that had two major overhauls in the span of probably five or six years and it used to go in for a clean and check annually, too, so it wasn't like it was neglected.