What was found
EMERGENCY POWER ON ALERT 1:15 INTO FLIGHT IAW QRH CYCLED SWITCH OFF THEN BACK TO ARM. EMERGENCY POWER ON LIGHT REMAINED. NO OTHER ALERTS DISPLAYED. DEPLOYED ADG IAW QRH. STOWED ADG (WRI 24-00/9915) ELECTRICAL SYS RETURNED TO NORMAL. RAN ALL THREE ENGINES IAW JRH. NO FAULTS FOUND DURING ENGINE RUN. EPCU PASSED RETURNED TO SERVICE REF AMM 24-08-01-5. EMERGENCY POWER TEST PASSED REF AMM 24-24-00-5. CANNOT DUPLICATE FAULT, ACFT OK FOR SERVICE.