As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW INFLIGHT - ON APPROACH FLAPS WOULD NOT EXTEND. GAUGE SHOWED NEEDLE SPLIT AT ZERO DEGREES. LEADING EDGE DEVICES EXTENDED BY ALTERNATE FLAP SWITCH. LANDED DFW WITHOUT INCIDENT. REPLACED FLAP SLAT ELECTRONIC UNIT. SYSTEM GROUND CHECKED NORMAL OPERATION.