TIMS showed Smoke External Alarm at carRear M2. Staff(AMK) checked and confirmed no signs of smoke / fire / burning smell on exterior or interior of train. ~~~~~ 2526 To check smoke detector and plaseal     Replaced done and security check and tested ok. Plaseal ok. #2526-Smoke detector:- Not: 2483191 raise. Done by Saini/Haslan. 26/04/23 2526 TIMS showed Smoke External Alarm CE 2526 found car having smoke external pre-alarm fault. No abnormality found n reset fault cleared. Depot 2526 smoke detector operational check.  2526 FC 721 registered once. Visual checked - All OK. Orp20 Raised for BSD to follow Up. Faiz 45040