As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2533 - EWR - FLIGHT CREW REPORTED L/G AIR GROUND FAIL MESSSAGE FLASHES A FEW SECOMNDS AFTER GEAR EXTENSION. EWR MX REMOVED AND REPLACED DOWN LOCK PROXIMITY HARNESS ON LT MAIN L/G. MX PERFORMED L/G EXTENSION AND RETACTION CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.