As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. EMERGENCY LIGHTS OVERHEAD SEATS 25 AND 27 RIGHT HAND SIDE FAILED TO STAY ON DURING TEST OF BATTERY PACK CAPACITY CHECK. REPLACED EMERGENCY POWER SUPPLY BATTERY PACK (M1672) PER AMM 33-51-06. OPERATIONS CHECK NORMAL.