As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT INSP, AIRCREW NOTICED THE EMERGENCY LIGHTS ON AFT CEILING INOPERABLE. GROUND MX CREW R & R THE EMERGENCY BATTERY PACKS PS1 THROUGH PS6. PERFORMED EMERGENCY LIGHTING CHECKS AND SYS OPS CHECKED SATISFACTORY. ACFT RETURNED TO FLIGHT STATUS.