DT check found 679/680 MR charge slow. DT 3679 air leak underframe3 ~~~~~ DT check found 679/680 MR charge slow. 3679 leaking.   Checked found #3679 Air Dryer constant purging air. Replaced new Air dryer and function tested satis. Performed pneumatic health cx, satis. S/N: 3515420311 (O) 3513070018 (N) Notification to CSC: 2541972    Done by Kumar, Yusof, Haikel. 13/11/2023.