As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA - DURING SCHEDULED PS CHECK, MAINTENANCE REPORTED ONE BATTERY PACK FOR THE EMERGENCY TO BE INOPERATIVE, ONE SET OF LIGHTS. MAINTENANCE REMOVED AND REPLACED THE POWER SUPPLY UNIT IAW ATR MM. OPERATIONAL CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. (M)