TC reported intermittent APS fault. Staff(MSL) checked and confirmed no fault found. Train performan ce - ok. ~~~~~ 3522 TC reported intermittent APS fault. Staff(MSL) confirmed no fault found. Train performance - ok. CE : T417-3521 Intermittent APS Fault. Fault Self Cleared. No Fault Code. OE : Check for any AC Compressor failure and isolate faulty AC Compressor.  3521 intermittent APS fault, FC 408/414. Found #3521 A/c 1-1 shorted to GND. Isolated wires U/V/W. Notif 2498788 raised for CCU c/o.  Au TK 45096 Notif 2498788 Name                              : AU T K    Date    Of    Occurrence          : 18/06/2023 Last    Service    Date           :   EMU/Equipment/Location            : 521/522 / CCU / 3521 A/C 1-1 Equipment Serial No. (if  any)    :   Description Of Fault/Cause        : A/C COMP MOTOR SHORTED TO GD Measurements    ( if  any )       :   Required   Rectification          : Required CCU C/O DUE TO                                          MOTOR SHORTED TO GD