As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REFERENCE LP571528 #3 DURING ENGINE 1 CHANGE EPSU UNIT 11WL FWD LEFT FAILED EPSU SYSTEM TEST. A/C WAS NOT GROUNDED. REMOVED AND REPLACED EPSU ASSY 11WL FWD. OPS CHECK GOOD. REF AMM 33-51-38-000-001-A/33-51-38-400-001-A. OK FOR SERVICE. /END/.