As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED, MDCR HAS INOPERATIVE EMERGENCY LIGHTS AT THE L3 DOOR INTERIOR LIGHT ABOVE THE DOOR AND EXTERIOR LIGHTS FIRST 3 ON THE LEFT HAND SIDE AND RIGHT HAND SIDE. REMOVED AND REPLACED POWER SUPPLY BATTERY PACK M33400 IAW AMM 33-51-06-960-803. EMERGENCY LIGHTS TEST GOOD IAW AMM 33-51-06-960-803.