What was found
(CAN) ON FINAL APPROACH, CREW SELECTED GEAR DOWN, THEY HAD NO INDICATION LIGHTS ON GEAR ANNUNCIATOR PANEL. ALL RT DIM ANNUNCIATOR LIGHTS WERE INOPERATIVE ON COPILOT SIDE. ACFT DID A GO AROUND, FOLLOWED CHECKLIST & LANDED WITHOUT INCIDENT. ON THE INITIAL INSPECTION DISCOVERED 3 CB TRIPPED, GEAR LIGHTS 3 AMP, GEAR WARNING CONTROL 3 AMP & FLT ANNUNCIATOR DIM RT 5 AMP TRIPPED. AFTER TROUBLESHOOTING RELATION BETWEEN ALL 3 SYS, IT WAS DISCOVERED RT GEAR DOWN LOCK SWITCH HAD SHORT CIRCUIT ON ALL SETS OF CONTACTS WITHIN THE SWITCH CAUSING RELATED CIRCUIT BREAKER TO TRIP. THE DOWNLOCK SWITCH WAS REPLACED NEW IAW MM. ALL OPERATIONS CHECKS COMPLIED WITH, ACFT WAS RETURNED TO SERVICE.