As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING AIR TURN BACK FOR SPLIT FLAP, INBOARD FLAPS DID NOT WORK IN ALTERNATE WORK, OK IN NORMAL. FOUND THAT THE INBOARD FLAP ELECTRIC MOTOR CLUTCH SLIPPING REPLACED ALTERNATE FLAP MOTOR ASSY PER BOEING M/M 27-51-17. OPERATIONAL CHECK OK PER M/M 27-51-00.