3678 Air Dryer Fault. To check and recti ~~~~~ 3678 Air Dryer Fault. To check and recti     Check and found dryer non-stop purging during compressor running.Check dryer connection ok.Micromest filter check clean and relay board check ok.Replaced air dryer and function test ok. Air dryer- Old s/n: 351436020 New s/n: 3512300002 Done by Sanip/Koh. 22/02/22