I think your Magnum welder is a reasonably good machine , is there something about it that you feel is not running well ? Taking the cover off and vacuuming or blowing out with compressed air could help but you can also cause damage doing this so unless you feel confident dont do it , you need to avoid blowing any conductive particles like grinding dust etc to cause short circuits on the control board or even into power parts like the transformer . Replacing the eurotorch with a new Murex torch improved my mig machine but the old one was really falling apart otherwise I would have just got a new liner/shroud/gas diffuser , unfortunately I still cant weld very well but at least I cant blame it on the machine.