TIMS showed APS fault at car 1673. Trainperformance - ok. TIMS showed APS fault at car 1673. Train performance - ok. ~~~~~ TIMS showed APS fault at car 1673. Train performance - ok. TIMS showed APS fault at car 1673.  1673 FC 408/414. Further check found A/C 1-2 U/V/W shorted to gnd. Cause APS fault. Isolated A/C 1-2 U/V/W and notif to HM:2542344. Normalise A/C 1 and monitor aircon ok. No APS fault occured Done by Haslan/Zulq 45244