As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - EEL - MX REPORTED LT AFT EPSU WAS FAULTING (INTERNAL LOAD) AND ASSOCIATED FLOOR PATHWAY LIGHTS DID NOT ILLUMINATE. MX REMOVED AND REPLACED THE AFT LT EMERGENCY POWER SUPPLY UNIT (13WL) IAW AWA TASKCARD R1C33303. OPERATIONAL CHECK WAS GOOD.