1522 during train prep dc reported APS F ~~~~~ Fault confirmed having intermittent APS fault on 1522. Checked via TIMS 1522 recorded FC414 and indicated to be intermittent. Further checks found 1522 A/C #1-1 motor shorted to ground. Isolate 1522 A/C #1-1 motor wiring and tagged. Raised N2398936 to HM (heavy maintenance) for CCU changeout. N.A/haszhan/aliff/13.07.22