As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN CREW REPORTS THAT EMERGENCY EXIT LIGHTS ABOVE 2L AND 2R ARE INOPERATIVE WHEN AIRBORN ONLY. OPS NORMAL ON GROUND. MX TROUBLESHOT AND FOUND AFT EMERGENCY POWER SUPPLY UNIT AT FAULT. R & R AFT EMERGENCY POWER SUPPLY (ALSO REPLACED BATTERY). LIGHTS OPS CHECK GOOD. ALL WORK DONE IAW AMM 33-51-38.