3638 - AIR DRYER ABNORMAL PURGING/ TO CH ~~~~~ 3638 - AIR DRYER ABNORMAL PURGING.  3638 air dryer & micro mesh filter replaced. Security/function test - OK. No air leak & change-over - OK. Performed pneumatic system check - OK. (refer to attachment)  Sarma/Alan/Lee PT/Shafie 44922 #3638 Air Dryer S/N : OLD : 351506026 NEW : 01513263