As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALL EMERGENCY EXIT LIGHTS FAIL PREFLIGHT TEST ON FIRST FLIGHT OF DAY. BATTERIES FAIL TO HOLD CHARGE. REPEAT WRITE UP. CORRECTIVE ACTION: REMOVED #4 EMERGENCY BATTERY PACK P/N: CB528-1 S/N: 009475 INSTALLED CUSTOMER SUPPLIED SERVICEABLE BATTERY PACK P/N: 6430028-1 S/N: M24-11648. PERFORMED OPERATIONAL CHECK. OPS CHECK GOOD. ALL WORK PERFORMED IN REF TO CE-680A AMM 33-50-00