Welding Tips and Tricks

The other day, when I went to use it, the mig function wouldn't work. I tested with tig and stick, both seem to be working well, but when you pull the trigger on Mig, nothing. No gas solenoid click, no wire feed motor running. I tested the switch on the gun and depressing the trigger caused my ohm meter to read no resistance, I even took a piece of .30 and tried to jump the pins on the machine. Nothing. I took the cover off, nothing loose or obvious, just wondering if anyone has any thoughts or experience with this?

This machine welds beautifully and has had maybe 3 8pd spools run through it, I'd love to get the mig function running again.