What was found
NON-ETOPS, FLT 90, HNL-KOA; LANDING GEAR INDICATOR LIGHTS WERE INOP WHEN THE LANDING GEAR EXTENDED. CONDUCTED A TOWER FLY BY TO CHECK FOR GEAR DOWN. UNEVENTFUL LANDING ACCOMPLISHED. FOUND SECTION 5 CIRCUIT BREAKERS POPPED. INSPECTED INDICATOR LIGHTS AND FOUND NR 1 ENGINE LOW OIL PRESSURE LIGHT BULB ARCING. REMOVED AND REPLACED BULB. OPS CHECK OK. AIRCRAFT RETURNED TO SERVICE.