TC reported TIMS showed smoke external at car 2522. Staff(RDH) checked and confirmed no sign of fireor smoke on the exterior of car 2522. Rear T339 did line cl ear and confirmed no abnormalities. ~~~~~ Found water ingress at 2522 No2 end smoke external sensor .Op 20 raised to replaced N.AKUMAR //14.07.21 --------------------   REPLACED #2552 NO 2 END EXTER L SMOKE DETECTOR UNIT DONE.TEST RUN SYSTEM AND MONITOR SYSTEM WORKING NORMALLY.JIMMY/ZHENG YI/JIAWEI  14.07.2021