As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 1397 - AFTER TAKEOFF BHM, LANDING GEAR HANDLE WOULD NOT COME UP. NO MFDU MESSAGE AFTER 400FT OF CLIMB. ACTIVATED OVERRIDE BUTTON AND LANDING GEAR RETRACTED. AIRCRAFT PROCEEDED TO DFW AND LANDED WITHOUT INCIDENT. PLACARD LANDING GEAR ANTI-RETRACTION SYSTEM. SUBSEQUENTLY, REPLACED LANDING GEAR ANTI-RETRACTION RELAY K1811A AND K1262 AT DFW. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)