TC reported TIMS shows: "Fire and SmokeDetector lost power" at car 2569. Fault self cleared. TC rep orted TIMS shows: "Fire and Smoke Detector lost power" at ca r 2569. Fault self cleared. ~~~~~ 2569 TC reported TIMS shows: "Fire and Smoke Detector lost power". Fault self cleared. Fault reccured at KRJ NB. CE : Found Tims shown 3570- fire external, Reset fault cleared. No abnormality found. Further check 2569 - no fault indication illuminated. Ok.  2569 FC735 (Fire & smoke detector lost power) multiple times. Replaced FCP. Old: 125 New: 106 #3570 FC721 (smoke external). Swapped SDR11 from #3570 to #1570.    OPS 20 raised to check external smoke detector.  Aliff/Redzwan 45385   3570 external smoke detector C/o done. Found faulty spare. C/o another sensor. Function test-Ok. Security check-Ok.   Ganesan / Jimmy / Metta / Raghu. 07.04.2024. 3570- External smoke sensor. Noti to RSW- 2587322. Faulty spare-Noti to RSW- 2587323.