What was found
ON APPROACH TO SEA THE ''EMERGENCY BUS OFF" LIGHT ON OVERHEAD PANEL LIGHT CAME ON, AND ON THE MAP PANEL THE AMBER APU, ELECTRIC, POWER OFF, DEICE AND BRAKES LIGHTS CAME ON. FOLLOWED QRH PROCEDURE TO AFM 3-8 PROCEDURE - EMERGENCY DC BUS FAILED.RESET EMERGENCY DC BUS 2 CB 0470. ALL SYSTEMS CHECK GOOD.