So...went outside yesterday and noticed my pump wasn't running. It's a Marathon RB134 (catalog number) pump. When it switches on the shaft actually spins for a few seconds (i can see it turn by taking the access panel off the back) and the motor hums really loud, then it stops. I can move the shaft freely with a screwdriver and I've replaced the capacitor. Anything else I can try other than getting a new pump?