TC reported Smoke Internal Alarm at Front M1 car. Staff (CTH) checked and feedback no signs of smoke/ fire / burning smell on exterior or interior of train. . ~~~~~ * ,N * 'From TIMS, 1551 FC720 occurred once (resettable) Checked FCP, no signs of water ingress, wire security ok Blow clean inlet and exhaust port of smoke detector Based on swapping history, swop AC controller from 1551 #2 AC (SN:841312) to 3566 #2 AC (SN:841399) for fault isolation purpose No fault occurrence during monitoring DONE BY:SANKAR/SOLEHHIN 27.09.2023