Does anyone have the schematic for an 874-D power controller? Or better yet, a good used circuit breaker? At least one of the three (ganged) breakers is internally flaky and will turn off if the handle is pushed upward all the way to "ON" (they work if the handle row is carefully lifted just far enough but obviously that is not reliable). It looks like the (original-type) Heinemann breakers are available but they are *very* expensive new... thanks Charles