As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REF T/C 78233008, EMERGENCY LIGHT BATTERY PACK M1675 WHICH PROVIDES POWER FOR L1 DOOR EXIT SIGN, L-1 SLIDE LIGHT, AND L1 DOOR EXIT LOCATOR SIGN FAILS AFTER APPROXIMATELY 60 SECONDS OF OPERATION. ACFT GROUNDED. REMOVED AND INSTALLED NEW BATTERY AND CHARGER REF AMM 33-51-06, OPS CK GOOD.