As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE, EMERGENCY POWER UNIT EPSU 11WL IN PASSENGER CABIN DOES NOT PASS TEST; REF AEROMAN N/R 2019-363259 - THE VISUAL INSPECTION OF THE WIRING OF THE TERMINAL BLOCK 7225VT-6 FOUND WIRE 3351-1780 IMPROPERLY CONNECTED AND WIRE 3351-1780 WAS CONNECTED PROPERLY ON POSITION "C" I.A.W AWM 33-51-07 SHEET 01 AND PERFORMED OPERATIONAL TEST I.A.W AMM 33-51-00-710-001, TEST IS OK.