Gday Paul .
Congrats on your NIB purchases . I can't bring myself to fork out the coin to buy NIB.
When you get an EM, grab the manual and the schematic . Armed with those and a good pair of eyes you will be able to find and fix any fault .
Once you understand how an EM works (and it ain't that hard) you'll be able to fix any EM cause they all work the same way, regardless of manufacturer .