What was found
ON FLAP RETRACT AFTER TAKEOFF. WITH FLAPS 0 SLAT EXT GOT FLAP DISAG ALERT. ATTEMPTED TO EXTEND FLAPS BACK TO 15 & FLAPS WOULD NOT MOVE. FLAPS INDICATED EXT/0. DUMPED 20,000 LBS OF FUEL & MADE 0/EXT LANDING. TOUCHDOWN AT 174 KTS. WEIGHT 362,000. T/S FLAP SYS REF FIM 27-50. INTERROGATED CFDS FCC 1 & 2 ALL 3 VIAS & ALL 3 AIU'S WITH NO FAULTS FOUND. PERFORMED RTS ON ALL ABOVE WITH NFF. PERFORMED OPS CHECK OF FLAP SYS. SYS OPERATES SMOOTHLY. RAN FLAPS 7 COMPLETE CYCLES WITH ALL INDICATIONS NORMAL. REMOVED LT & RT OTBD FLAP POS TRANSMITTER PANELS 535 BR & 625 BR. VISUALLY INSPECTED MECHANISMS. NO DEFECTS NOTED. R & R INBD FLAPS CONTROL VALVE & ASSOCIATED RESTRICTORS & CHECK VALVES. LEAK CHECKS GOOD. REF MM 27-52-02-2. PERFORMED ADJUSTMENT TEST OF INBD FLAP CONTROL VALVE REF MM 27-52-02-2. NO DEFECTS NOTED AT THIS TIME. PERFORMED OPS TEST OF FLAP HYD ACTUATION SYS NO DEFECTS NOTED REF MM 27-50-00. RII FOR INSTALL OPS & LEAK CHECK. AWAITING TDR RESULTS.