As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING TASKCARD 78233001, EMERGENCY LIGHTS OPERATIONS & BATTERY PACKS FUNCTIONAL CHECK AFT LEFT SECTION OF EMERGENCY LIGHTS FAILED AFTER FOUR MINUTES. ACFT GROUNDED. REPLACED AFT LT BATTERY PACK IN THE GALLEY AREA IAW MM 33-51-06, SYSTEM OPS CHECKED GOOD.