As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL250 RECEIVED LT 10TH STAGE DUCT MESSAGE, RAN QRH, MESSAGE PERSISTED UNTIL ARRIVAL TO GATE. SYNOPTIC PAGE FROM APU LCV TO LT PACK SHOWED YELLOW. PERFOMRED A CONDUCTIVE TEST IAW CMM 26-14-12, LOOP A50WK WAS FOUND TO BE SHORTED. RESISTANCE BTW CONDUCTOR AND OUTSIDE HAS BEEN FOUND TO BE 14 OHMS. REMOVED AND REPLACED LOOP A50WK IAW AMM 36-21-04.