As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER COMPLETE SHUTDOWN AND BATERIES UNPLUGGED THE MAIN CAGIN DOOR EMER EXIT SIGN, THE OUTSIDE WING INSPECTION LIGHTS AND THE READING LIGHT OVER SEAT 3 AND FLOOR LIGHT UNDER SEAT 3 WILL NOT TURN OFF. REMOVED INOP #2 E-LIGHT BATT PIN CBS28-1 SIN 5729M AND REPLACED WITH REPAIRED E-LIGHT BATT PIN C8S28-1 SIN 008359. OPS CHECK COMPLETED OK. REF IMM 25-20-21 AND AMM 33-50-06.