As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE EMERGENCY EXTERIOR LIGHT AND INTERIOR LIGHTS ASSOCIATED WITH THIS BATTERY PACK ARE NOT ILLUMINATING WITH THE EMERGENCY LIGHT SWITCH SELECTED ON. THE EMERGENCY EXTERIOR LIGHTS ARE CONSIDERED INOPERATIVE. PERFORMED FUNCTIONAL CHECK. UNABLE TO DUPLUCATE SQK. PERFORMED EMERGENCY BATTERY CAPACITY CHECK. ALL BATTERIES CAPACITY CHECK GOOD. WORK DONE IAW MAINTENANCE MANUAL (REV 31) 33-50-10.