As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING COCKPIT PREPARATION "EMERG LT BAT 1 LO" LEVEL 1 ALERT DISPLAYED ON EAD. VERIFIED FAULT AND DEFERRED EMERGENCY LIGHTING SYSTEM PER MEL 33-50-4. DMP C/W, PLACARD INSTALLED AND DI LOG UPDATED AS REQUIRED.REPLACED EMERGENCY PWR SUPPLY BATTERY IAW AMM 33-51-01-01-400-801 AMD AMM 33-51-01-000-802. OPS CK GOOD IAW AMM 33-51-01-700-802. THIS CLEARS DMI M810813. REVERSED DMP 33-50-4, REMOVED PLACARD.