TC reported TiMS showing fire external at frond DT car. Rear T221 line clear into City Hall SB stati on no heat or smoke. Staff(RFP) checked no heat or smoke. TCreported TiMS showing fire external at frond DT car. Rear T  ~~~~~ TC reported TiMS showing fire external a Check and found #3616-No 2 smoke dectector dusty.Clean and function test ok.To be monitor at M/L. Done by Rizman.  20/12/22