As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT GEAR WILL NOT LOCK IN THE UP POSITION AFTER TAKEOFF. RED IN TRANSIT LIGHT WAS ON AS WELL AS LT RED GEAR UNSAFE LIGHT. RETURNED TO DTW. MAINTENANCE CLEANED CONNECTOR ON UNDERCARRIAGE SWITCH, DID TEST OF HANDLE PER AVRO AMM 32. OPS CHECKED GOOD.