3640 air dryer continous air purging ~~~~~ 3640 air dryer continous air purging     Replace dryer ok.Mesh filter check no abnormal.MR tank no water.Function test dryer change over ok.Air leak test 0.4bar/5min. #3640-Air Dryer unit:- New s/n: 3512450001 Old s/n: 3513070017 Not: 2450271 Done by Koh/Sanip/Rizman. 05/01/23