You must test the capacitor with a Multi Meter with Capacitor Tester if you meter has it. You can not test a Capacitor with Ohm;s you could blow your meter if done so due to the current stored in the capacitor. The Brown or Black residue on the motor could be from your capacitor melting or blown. There is a wax residue if it burns out. Did you find the capacitor on the back wall under the hot/cold valves? or it could be mounted to the motor? Let us know what you find. If your motor is pulling more than 9.9 amps it could be the windings in the motor overheating. Put an Amp meter on the Black wire coming from the 110 volt electrical cord on the console and you'll see how much amps your motor is pulling in spin, agitate cycle.