As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DAILY CHECK ON A/C 976 FOUND THE LEFT & RIGHT OVERWING EMERGENCY LIGHTS NOT WORKING DURING TEST. DURING T/S THE BATTERY-POWER SUPPLY WAS FOUND TO BE INOP. ONE UNIT SUPPLIES BOTH SIDES. REMOVED AND REPLACED BATTERY PACK IN AFT CARGO PIT FOR LEFT AND RIGHT EXTERIOR EMERGENCY EXIT LIGHT. REF MM 33-53-00, OPS CHECKED NORMAL.