What was found
FLT 31 - BED-BUF - AFTER TAKEOFF WITH GEAR UP, CREW NOTICED RIGHT MAIN GEAR RED AND YELLOW DOOR LIGHTS FLASHING OFF AND ON. FLIGHT ATTENDANT VERIFIED RIGHT AFT GEAR DOOR WERE OPENING AND CLOSING. CREW RETURNED TO FIELD AND MAINTENANCE WAS CALLED AND PROXIMITY SENSORS WERE CLEANED AND PSEU WAS RERACKED. MAINTENANCE CHECK FLIGHT WAS PERFORMED AND WAS UNSATISFACTORY. AIRCRAFT WAS FERRIED TO BUFFALO. RIGHT MAIN GEAR UPLOCK PROX SENSOR WAS REPLACED, RIGHT GEAR DOOR ADJUSTED AND GEAR OPS CHECKED GOOD. (M)