3508 Air Dryer Fault. To check & rectify ~~~~~ 3508 Air Dryer Fault.(DT Check)  3508 found FC 704 on TIMS ER. Replaced air dryer & micro mesh filter. Function check - OK, no air leak found. Air compressor Cut-in/out, charging time checked - OK. Air dryer 2 min chage-over - OK.  Sarma/Farid 44464 #3508 Air Dryer S/N : OLD : 015-13699 NEW : 015-14350