As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ANC - FLT 1481 - AIR RETURN DUE WING FLAPS WOULD NOT RETRACT PAST THE TAKEOFF POSITION AFTER TAKEOFF. A LANDING WAS MADE AT ANC WITHOUT INCIDENCE. MAINTENANCE CLEANED AND LUBED THE LEFT AND RIGHT FLAP SAFETY SWITCHES. AFTER OPERATIONAL CHECKS CONFIRMED THE FLAP SYSTEM WORKING NORMALLY, THE AIRCRAFT WAS RETURNED TO SERVICE. REFERENCE CONTROL NR HERA9505.