As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A MAINTENANCE VISIT, THE CEILING EMERGENCY LIGHTS ON THE LEFT AND RIGHT SIDE FROM ROWS 22 TO 31 WERE FOUND TO BE INOPERATIVE. MAINTENANCE FOUND PACK M7919 AT DOOR 3L CAUSING THE FAULT. MAINTENANCE REPLACED THE POWER PACK AT 3L DOOR. SYSTEM OPERATION WAS NORMAL AFTER THE POWER PACK WAS REPLACED.