TC reported TIMS showed Smoke External Alarm recurred after CE reset alarm at BDL NB at Rear M2 car.TC reported CE is still onboard. ~~~~~ #2531 - check and found smoke external detector water ingress. Replaced smoke external detector and function check-ok. Notification no: 2564672. Replaced #1532 smoke external (MO:11889003) Done by: Gopal and Samsudin