What was found
FLAPS FAIL CAUTION, FLAPS CONFIRMED AT ZERO DEGREES, COMPLIED WITH QRH. REMOVED AND REPLACED FLEX DRIVESHAFT NR 1, (PDU TO INBOARD FLAP) AS PER AMM 27-53-10, OPS TEST OF FLAPS GOOD AT THIS TIME. INSPECTED FLEX SHAFT, FOUND NO BARBER PULL. REMOVED MOISTURE AND LUBED REF AMM 27-53-10. (M)