As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERG EXIT SIGN/LIGHT: CABIN MAIN DOOR UPPER EXIT SIGN DOES NOT LIGHT UP DURING PREFLIGHT TEST. PERFORMED T/SHOOTING AND FOUND NO2 EMERGENCY LIGHT BATTERY PACK INOP. REMOVED AND REPLACED NO EMERGENCY LIGHT BATTERY PACK WITH A CUSTOMER SUPPLIED REPAIRED PART. PERFORMED SATISFACTORY OPS CHECK OF EMERGENCY LIGHTING SYSTEM I/A/W CE-680A AMM 33-50-06.