Staff(KRJ) feedback T207 loud air discharge from undercarriage of Rear DT car. TC confirem no fault indication and MR pressure was healthy. Staff(CCK) checked a nd confirmed no abnormalities. ~~~~~ Staff(KRJ) feedback T207 loud air discha Check and found Air dryer keep purging air.To follow up c/o Air Dryer. 0020 raise to follow up. Checked by Zulq/Saini/Haslan. 15/08/22 3683 to follow up change out air dryer Air Dryer c/o done.Change out micro mesh filter due to oily.Function test Dryer change over ok.Cut in 8.4b,cut out 10.4b,CT 2min 10s,Air leak test 0.2b/5min.Air compressor safety v/v function test ok. Air Dryer- Old: 3515210286 New: 3515480327 Not: 2408743 raise. Done by Sanip/Koh. 16/08/22