TC reported smoke external alarm at FDTcar. Staff(EUN) checked and confirmed no signs of heat or sm oke found. Rear T137 did a line clear and confirmed no signsof heat or smoke found. TC reported smoke external alarm at  ~~~~~ Fault could not be duplicated. Checked fire panel - no anomalies, no signs of water ingress. Checked smoke sensor - no water ingress. Cleaned dust from smoke sensor. For monitoring, swapped 3513 fire panel to 1513. Further monitored - no fault occurred. N.A/sharif/fairuz/03.08.22