As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 810 SDQ-JFK, ON WEEKLY CHECK FOUND "EPSU AFT L" MSG & WHEN EMERGENCY LIGHTS TURNED ON 3 AFT AISLE EMERGENCY LIGHTS INOP. REMOVED AND REPLACED 10WL EMERGENCY POWER SUPPLY UNIT IAW AMM REF 33-51-38. EMERGENCY LIGHTS TEST NOW GOOD & ALL LIGHTS OPERATIONAL.