What was found
DISPATCH RECEIVED A CALL FROM MGW STATION THAT THEY HAD BEEN CONTACTED BY FLT 4740 AND INFORMED THAT THE AIRCRAFT DID NOT HAVE 3 GOOD DOWN AND LOCK INDICATIONS FOR MAIN LANDING. CREW WAS ADVISED TO FOLLOW CHECKLIST AND DIVERT. THEY LEARNED LATER THAT CREW HAD 3 GOOD DOWN AND LOCK INDICATOR AFTER TROUBLE SHOOTING LANDING GEAR DOWN LOCK INDICATOR. AIRCRAFT LANDED WITH NO FURTHER INCIDENT. INDICATOR WRITTEN UP. CLEANED ANNUNCIATOR SOCKET AND REBULBED.