What was found
ON FINAL, RECEIVED "EMER PWR ON" ALERT. AFTER LANDING, RECYCLED EMERGENCY POWER SWITCH AND CPT DISPLAY UNITS 1,2,3 WENT BLANK/DARK WITH NR 2 DISPLAY RED "X". TRIED TO RECYCLE AGAIN WITH NO CHANGE. DUPICATED SYMPTOMS AT BLOCK-IN. ON ELECTRICAL PAGE, FOUND LT EMERGENCY AC BUSS IN AMBER. PULLED AND RESET LT EMERGENCY AC BUSS CIRCUIT BREAKER, ALL SYMPTOMS WENT AWAY, EPCU R-T-S OK. OK TO CONTINUE.