What was found
ON TAKEOFF, POSSIBLE LIGHTING STRIKE. SHORTLY AFTER RECEIVED (EPGS FAULT) AND (EMERG PWR ON) ALERTS. ALL BUSSES POWERED, ALL GENERATORS OUTPUT NORMAL. REFD QRH AT SAME TIME CAPT'S NO DEFECTS DISPLAYED (MAP FAIL ALERT. SELECTED CAPT ON FMS2 AND CONTINUED ON (OPERATION WITH A SINGLE FMS) IAW QRH. RECEIVED BUSS L EMERGY AC OFF) ALERT SELECTED (EMERG PWR OFF) AND REGAINED FLIGHT DISPLAY DATA. DEVERTED TO KPDX AND DECLARED AN EMERGENCY PERFORMED LIGHTING STRIKE INSPECTION IAW MM 05-53-01-6. NO DEFECTS NOTED. REMOVED AND REPLACED LT EMERGENCY SENCE RELAY AND RESET EPGS FAULTS IAW 24-20-00.FIG 101 AND PERFORMED RTS OF EPCU. TEST PASSED A/C OK FOR SERVICE.