What was found
BDA - FL 1535 - ON APPROACH TO BDA, LANDING GEAR WAS EXTENDED WITH NO GREEN LIGHTS APPEARING. CREW ACCOMPLISHED A FLYBY AND THE TOWER CONFIRMED THE GEAR WAS DOWN AND LOCKED. FLIGHT WENT INTO HOLDING PATTERN TO GO THROUGH CHECKLIST AND TO VISUALLY CHECK THAT GEAR WAS DOWN AND LOCKED. FOUND AIR/GROUND RELAY CIRCUIT BREAKER POPPED. TRIED TO RESET BREAKER BUT WOULD NOT RESET. FLIGHT MADE A NORMAL LANDING AT BDA AND LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE RESET AIR/GROUND CIRCUIT BREAKER ON GROUND. BREAKER REMAINED IN. PERFORMED GEAR POSITION CHECK PER MM 32-09-20. OPS CHECK GOOD.