What was found
(CAN) FLAP FAIL ON APPROACH. WHEN FLAPS SELECTED THE FLAPS DID NOT MOVE FROM ZERO DEGREES. FLAPLESS APPROACH AND LANDING CARRIED OUT WITHOUT FURTHER INCIDENT. ACFT FERRIED FOR FLAP REPAIR. ALL FLAP ACTUATORS REPLACED, RT NR 1 FLAP DRIVE ASSY REPLACED DUE TO DAMAGED CORE, RT NR 2 AND NR 3 DRIVE CABLES FOUND WITH MOISTURE CONTAMINATION-CORE AND CASINGS CLEANED AND RELUBED. LT NR 1 FLAP DRIVE FOUND WITH MOISTURE CONTAMINATION-CLEANED AND RELUBED. LT NR 5 FLAP DRIVE DEFORMED BEYOND LIMITS. REPLACED FLAP POWER DRIVE UNIT. ACFT TEST FLOWN SUCCESSFULLY AND RETURNED TO SERVICE.