TIMS showed rear DT air dryer fault. MR9bar. Train performance - ok. ~~~~~ 3528 TIMS showed air dryer fault. MR 9 bar. Train performance - ok.  3528 air dryer replaced - Done. Security/function test - OK. 3528 Air Dryer S/N : OLD : 3516320329 NEW : 3512300003  Goh AT/Chan GF/Alan 44076