As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE SHUTDOWN, THE EMERGENCY LIGHTS WOULD NOT SHUT OFF. AFTER PLUGGING IN THE GPU, THEY WOULD NOT ARM. REMOVED AND REPLACED BATTERY PACKS IAW AMM 33-50-10-04-1. PN: 3301-51 PERFORMED OPS TEST IAW AMM 33-50-00-05-1. OPS TEST GOOD. REF CONT CARDS FOR DETAILS.