TC reported Rear M2 car smoke external and fire external. Staff(CCK) checked, confirmed no sign of f ire or smoke. Rear T212, ATPM line clear into CCK SB, feedba ck no abnormalities. ~~~~~ #2532 Found external smoke trigger few times. (Tims fault code: 721 smoke external). Further check smoke detector found water inside terminal box. Replaced whole smoke dectector set and conduct smoke test ok. Apply plaster seal on terminal box side to avoid water ingress. Done by Kalees/Sateesh/Alauddin. 03/01/21.