What was found
RDU TO CLE - ON APPROACH TO CLE FLAPS WERE SELECTED FROM 0 TO 9 DEGREES AND SHORTLY AFTERWARDS, A FLAP LOW SPEED MESSAGE APPEARED FOLLOWED BY FLAP FAIL. THE FLAP POSITION INDICATOR SHOWED FLAPS AT ZERO DEGREES. THE QRH WAS FOLLOWED AND THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE INTERROGATED THE CMC FOR FAULT CODES AND FOUND A MESSAGE FOR FLAP JAMMING. DURING TROUBLE SHOOTING THE RIGHT FLAP VELOCITY SENSOR, RIGHT FLAP MOTOR BRAKE, AND THE RIGHT FLAP MOTOR WERE ALL REPLACED WITH NO FIX. THE SYSTEM WAS FINALLY TROUBLESHOT DOWN TO A FAULTY FLAP POWER DRIVE UNIT. THE FLAP POWER DRIVE UNIT WAS REPLACED AND THE FLAPS WERE RIGGED TO THE ZERO POSITION. FLAP OPERATIONAL CHECKS ON THE GROUND AND DURING THE TEST FLIGHT WERE ALL GOOD, WITH NO FURTHER DEFECTS FOUND.