What was found
DURING APPROACH, ALL LANDING GEAR INDICATION LIGHTS DID NOT ILLUMINATE AND THE LANDING GEAR CONTROL CIRCUIT BREAKERS P-27 POPPED WHEN LANDING GEAR WAS EXTENDED. THE FLIGHT CREW FOLLOWED COM PROCEDURES, DECLARED EMERGENCY, AND LANDED WITHOUT INCIDENT. MAINTENANCE REPAIRED THE ANNUNCIATOR SOCKET FOR THE LEFT HAND LANDING GEAR DOWN AND LOCK INDICATION. OPERATIONAL CHECK OK.