What was found
JAN - FLT 3578 - DURING TAKEOFF, CREW REPORTED POWER INTERRUPTION ON THE AIRCRAFT. THE FIRST OFFICER'S INSTRUMENT SCREENS WENT BLANK FOR APPROX 5 SECONDS WITH ASSOCIATED RELAY CLATTER. TAKEOFF ABORTED. DURING TAXI TO GATE, IT HAPPENED AGAIN. FLIGHT ATTENDANT REPORTED THE EMERGENCY LIGHTS CAME ON DURING POWER INTERRUPTION. MAINTENANCE REMOVED AND REPLACED DC BATTERY PROTECTION CONTROL UNIT IAW ATR MM. OPERATIONAL CHECK GOOD, AIRCRAFT RETURNED TO SERVICE. (X)