Report "Liftmaster 1254LM garage door opener. Just successfully replaced the sprocket and gear assembly. The unit won't work. I did not note the correct wiring (which wire to attach to which post) for the capacitor. At first, the door 'open'ed only but would not reverse to 'close'. I changed the wiring and nothing has happened since. Did I blow the capacitor? I have an electrical test meter but don't know how to test the capacitor with it. Could I just have the wiring incorrect. There are, of course, (2) red and (2) blue wires to connect to the capacitor. Can you help me?"