As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE RT GEAR INDICATION LIGHTS DID NOT ILLUMINATE WHEN GEAR WAS EXTENDED FOR LANDING AT EWR. A GO-AROUND WAS PERFORMED AND THE GEAR WAS VISUALLY CONFIRMED DOWN. THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE RT GEAR SOCKET WAS PUSHED BACK AND NOT LOCKED. THE LANDING GEAR INDICATOR WAS REMOVED AND REPLACED IAW MM 32-60-03. OPERATION OF THE LANDING GEAR INDICATION LIGHTS CHECKED GOOD.