ground run the engine for a tank to get the credi credi (pronounced creedee) out of it and check the tuning. test the integrity of the hinges, control horns, and reseat all the servo leads to the receiver. make sure all the servo mechanical connections are secure, servo mounting screws, servo arms. if it is on a not normally used transmitter, I would definitely cycle those batteries also, and check the antenna security. basically, treat it like it is going to maiden again. I hate finding loose fasteners, but I hate finding them worse in flight....