What was found
AFTER TAKEOFF DURING FLAP RETRACTION, RECIEVED A WARNING BELL AND FLAP SYS 1, FLAP SYS 2FAULT. FLAPS WERE STUCK BETWEEN 15-20, CYCLED HANDLE AND DID NOT CLEAR RAN QRH AND RTB. DURING AFTER LANDING CHECK, FLAPS RETRACTED. REVIEWED FAULT CODE FORM NR 1 SFCC, GOT "FLAP JAM" MESSAGE. RECEIVED HIGH SPEED V MESSAGE FROM NR 2 SFCC. FOUND RT WING NR 3 AND NR 4 FLAP JACKSCREW JAM DETECTOR TRIPPED OUT. R & R HIGH SPEED SOLENOID VALVEK. FOUND RT NR 3 & 4 FLAP JACKSCREW WORN OUT. R & R RT WING NR 3 FLAP JACKSCREW. R & R THE RT WING NR 4 FLAP JACKSCREW.