As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AIRCRAFT NOT GROUNDED) (DEFECT DISCOVERED DURING AC HEAVY MX VISIT) NRC 7000-0006: IN AFT PASSENGER CABIN, ALL LIGHT RELATED TO EPSU 13WL INOP. EPSU TO REPLACED. IN AFT PASSENGER CABIN, EPSU 13WL REPLACED AND TESTED SERVICEABLE IAW AMM 33-51-38-400-001-A"