What was found
ORD - FLT 1731 - AFTER TAKEOFF DTW, UNABLE TO RAISE MAIN LANDING GEAR. LANDED ORD WITHOUT INCIDENT. REMOVED MAIN LANDING GEAR DOWNLOCK PINS. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
ORD - FLT 1731 - AFTER TAKEOFF DTW, UNABLE TO RAISE MAIN LANDING GEAR. LANDED ORD WITHOUT INCIDENT. REMOVED MAIN LANDING GEAR DOWNLOCK PINS. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)