TIMS showed Smoke Internal at car 3535.Staff (SIM) checked and feedback no abnormalities in train. Rear T128 did line clear from PSR2 to SIM2 confirmed no sig ns of smoke sighted along the way. ~~~~~ CHECKED WITH TIMS CONFIRMED SHOWED #3535 HAVING SMOKE INTER L FAULT.FAULT CODE 720.SERVED BOTH RETURN AIR GRILL AREA WITH AIR HOSE /WIPES O  EXCESSIVE DUST.SECURITY/FUNCTION CHECKED WITH SMOKE SPRAY ALL OK WORKING NORMALLY.FOR PREVENTIVE MEASURE RE PLASEAL SMOKE EXTER L ,CLEAN O  EXCESSIVE DIRT FOUND NO SIGN OF WATER INGRESS ON RELAY/SENSOR AREA.TO BE MONITORED DURING MAINLINE REVENCE.ZOHRI/YUSRI/SURENDAR/HAIRUL S 24.04.2023