During train prep-Found #1564 internal f ~~~~~ During train prep-Found #1564 internal fire alarm activated.  1564 swapped Fire Control Panel to #2564. Fault still persisted. OPS 20 raised to BSD/TWD to replace smoke detector unit.  Sarma/Kiran 44390 Fire Control Panel S/N : (after swapped) #1564 : 170 #2564 : 181 To follow up     Check and found #1564 external smoke detector water ingress into PCB. Replace smoke detector function test ok. Done by Sanip. 14/07/21