I have a millermatic 180 mig welder that i bought new 6 years ago. It has been a great machine until now, the shielding gas is always flowing when the welder is on. as soon as i turn on the welder you hear the click of the gas solenoid that you usually hear when you pull the trigger. If anybody knows anything about them please help me figure it out. i did try unplugging the wires to the gun and gas still flows. after that i unplugged one of the 2 wires to the gas valve/solenoid and the gas flow stopped. does this mean it is a problem in the board "hoping not" or could it still be the gas solenoid thing?