As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MX PRE-FLIGHT FOUND OVERHEAD EMERGENCY LIGHTS AT CENTER, AND R1 DOOR AND R1 EXTERIOR LIGHT INOP. ATTEMPTED TO CHARGE BATTERY FOR OVER AN HOUR, NO FIX. REMOVED AND REPLACED EMERGENCY LIGHT BATTERY (M730) AS PER ABOVE REF. ALL LIGHTS NOW WORKING. A/C OK FOR SERVICE.