As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS - OPERATIONAL TEST WITH THE TEST SWITCHES PROCEDURE - FOUND BATTERY PACK M33406 INOP. RELATED EMERGENCY LT INOP OVER DOOR AREA, MAIN AISLE, MED 4L EXIT SIGN & MASTER CALL EXIT SIGN MED L& R. REF SSM 33-51-15-103. REPLACED WITH A NEW BATTERY PACK IN DOOR 4L M33406 POSITION AND CHK FUNCTION NORMAL