TC reported obstacle detected at car 3549. SM BGS boarded the train to monitor train doors in car 35 49 and feedback no abnormalities. ~~~~~ Check and found 3549 TIMS FC740 Obstacle detected and cleared. Found 3549 B side wire integrity to Obstacle detector switch fluctuating during impedance check. Remove old insulation , check wire connection. Rejoined and resecured wire connector. Check - ok Replaced new  insulation, Function check - ok. 3549 Side check - ok."  /ALIE /20.04.22