What was found
EN ROUTE, ACFT EXPERIENCED ST ELMOS FIRE ON THE WINDSHIELD WITH SOME PRECIPITATION STATIC. THE MASTER CAUTION LIGHT CAME ON. STARTED THE EMERGENCY CHECKLIST. PULLED LT TRU CIRCUIT BREAKER. 1 MIN LATER, EXPERIENCED LOSS OF PANEL LIGHT ON THE OVERHEAD, GLARESHIELD AND THE CAPTAIN'S INSTRUMENTS. THE DC VOLTMETER SHOWED ONLY BATTERY POWER. RETURNED TO PDX. RESET AC/DC GENERATORS, ALL POWER CAME BACK AND STAYED ON UNTIL LOWERED THE GEAR ON FINAL. AFTER THE GEAR CAME DOWN, EXPERIENCED NR 1 AC GENERATOR CAUTION LIGHT (THE GEN WON'T RESET). ACFT LANDED WITHOUT INCIDENT. MX R/R NR 1 AC GEN, NR 1 GCU, AC PWR MONITOR, AC PWR MONITOR ELEC CONNECTOR AND REMOTE CONTROL C/B. PERFORMED TEST OF THE ELEC SYSTEM.