As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN EMERGENCY LIGHTS REMAIN ILLUMINATED WITH SWITCH IN ARM POSITION. WHILE ON BATTEY POWER & DURING ENG STARTS, EMERGENCY LIGHT NOT ARM CASS MESSAGE DISPLAYED WITH SWITCH IS IN ARM POSITION. WITH A GPU OR GENERATOR ONLINE CASS MESSAGE WILL EXTINGISH BUT CABIN LIGHTS REMAIN ON. REPLACED BATTERY IAW MM 33·52-01. OP CHECKED GOOD.