What was found
FLIGHT 3798 BWI TO LGA HAD TO DIVERT TO PHL DUE TO THE NR 1 DC GEN FAILING AND THEN THE NR 2 DC GEN FAILING. AIRCRAFT BRIEFLY ON BATTERY POWER. NAVS, PRESSURIZATION, AND ANTI-ICE SYSTEMS WERE LOST. AN EMERGENCY WAS DECLARED AND THE FLIGHT DIVERTED TO PHL. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE CLEANED ALL ENGINE CONNECTORS AND WING ROOT CONNECTORS. THE BUSS BAR PROTECTION UNIT WAS REPLACED. AIRCRAFT WAS GROUND RUN, ALL SYSTEMS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.