As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON PREFLIGHT, RECEIVED A LEVEL ONE EMERGENCY LIGHT BATTERY ONE LOW WARNING. PERFORMED EMERGENCY LIGHT TEST AND ALL TEST PASSED. NEXT MORNING RECEIVED THE MESSAGE AGAIN. R & R EMERGENCY LIGHTING BATTERY POWER SUPPLY. CHECKED GOOD IAW AMM CH 33-51-01-4.