What was found
FLAP CONTROL FAULT ON FLAP RETRACT, WOULD NOT RESET. OUTBOARD FLAP PAIR STUCK AT 15 DEGREES. RETURNED TO SFO. (3RD REPEAT). READ FAULT CODES AND TROUBLESHOOTING CODES SOL SHORT TO GROUND IAW INSTRUCTION PROVIDED. CLEANED OUT LEFT OUTBOARD FLAP ACTUATOR EXTENSION AND RETRACTION SOLENOID. OHM IS WITHIN LIMITS PER MM 27-50-00. ALSO PERFORMED FLAP ACTUATOR VELOCITY TEST AND DRIFT TESTS, BOTH TEST NORMAL. REPLACED LEFT OUTBOARD FLAP ACTUATOR DUE TO FAULT CODES. PER MM 27-50-00 RII CARD 27-307 TASK CARD. CYCLED FLAPS AND CLEARED ALL FLAP FAULTS. OPS CHECK OF FLAPS GOOD ON GROUND.