My Performax 25" drum sander drum motor has begun to shut down in the midst of modest stock sanding. It has a 1.75hp 120vac motor with the SmartSand amp control system and the motor never feels hot, so unlikely its an overload issue. After 5-10 min. of sitting idle it fires back up. There are two capacitor covers and I have yet to investigate to see which one may be the run or start cap. Beyond a leaky cap how else do I determine which is which and if one is toast. Don't have a manual to review and I know the SCM wisdom pool will have an answer. Thanks, John