As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE TESTING THE EMERGENCY LIGHTS DURING PRE-FLIGHT, SEVERAL INTERIOR OVERHEAD LIGHTS AND 3 EXTERIOR LIGHTS FAILED TO ILLUMINATE WITH THE EMERGENCY SWITCH IN ARM. REPEAT WRITE-UP. GAINED ACCESS TO ALL 4 EMEGENCY BATTERIES REMOVED DEFECTIVED ONES AND INSTALLED REPAIRED UNITS IAW MM33-50-10. CHARGED AND OPS CHECKED BATTERIES & EMERGENCY LIGHTS, WORK DONE IAW AMM 33-50-00. OPS CHECK GOOD AT THIS TIME