So yeah, after a solid summer of no problems, I have one now. My main pump won't fire up. I found the timer stopped in the on position and the breakers in the off position. When I set the correct time on the timer and try to start up the pump, I see an arc of electricity behind the timer and the pump is humming. Sounds very much like a short.
I had a similar problem with the other pump and ended up re-wiring the whole thing from the timer to the pump and that fixed it. This pump is not very old, maybe a little more than a year.