Quoted from Jediturtle:
I'm not familiar with the mech (I had a pro), but many times a buzz from a coil can be caused by a slightly loose coil stop. Check to make sure the coil stop (and the rest of the mech for that matter) is nice and tight.
Everything seems tight. I think the coil is Coil - 32-1800, which I guess is magnetic. In the diagnostics menu when I test it, its just a momentary test.