What I'm saying is that the repairman didn't do any in depth testing besides checking for voltage at a few points on the PC board (he told me that on the phone)... the company KNOWS that these two components are the weak point in these machines and are prone to failure, so they don't even wait for him to tear into it in earnest... they just send the parts they know are going to be bad.
And, as I've seen over on a Miller forum on "welding web"... there are a few resistors and one other component that some owners have found to have "popped" on the boards on their broke down MM211 machines. So, if I can get the fixit dude to give me the parts he pulled... maybe I could find the defective components and attempt to replace them so I'd have a spare.