As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT, DURING FLAP EXTENSION TO 5, THE FLAPS SPLIT AND LOCKED OUT AT 1-2. FLIGHT RETURNED TO THE GATE. MAINTENANCE REPLACED FLAP POSITION INDICATOR WITH SERVICEABLE UNIT. PER AMM 27-58-41-404-004. OPS CHECK OK PER AMM 27-58-01-725-001.