As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 1451 - RIGHT MAIN LANDING UNSAFE MESSAGE ON MFDU. USED ALTERNATE GEAR EXTENSION. LANDED ORD WITHOUT INCIDENT. REPLACED RIGHT UPLOCK ACTUATOR LINE. JACKED AND CYCLED GEAR, NO FAULTS NOTED. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)