As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SCHEDULE MX - SVC/RTN - ONT - DURING OVERNIGHT INSPECTION MX PERSONNEL FOUND EXIT LIGHT BY LEFT EXIT WINDOW WON'T LIGHT UP. MX PERSONNEL REMOVED AND REPLACED AFT FLOOR EMERGENCY BATTERY PACK AND PERFORMED OPERATIONAL CHECKS SUCCESSFULLY. THE A/C WAS APPROVED TO RETURN FOR SERVICE.