As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF, FLAPS EXTENSION FLAG WARNING WAS ON AND OFF. VISUALLY CONFIRMED FLAPS MOVING. FLAPS SELECTED TO 0 POSITION AND RETURNED TO AIRPORT WITH A NORMAL LANDING. MAINTENANCE PERSONNEL REPLACED FLAP BLOCK VALVE IAW MM. OPERATIONAL CHECK FOUND SYSTEM WORKING PROPERLY. (K)