Ive used this before in a stepper and so far it has held up OK.
Hey Goodolddays.. its easy from this end to say its enjoyable.. ive had many an EM make me pull my hair out.
I must admit that i was getting to the point where i was going to pretty much throw in the towel as we had exhausted all logic paths and suggest you follow each wire from the BUST relay to find some worm braid that was giving ground on a piece of metal or even 2 wires worn away against each other.... horrible work, but ive had to do it so many times

Gday Gav .

I've also had my share of frustrating EM faults before .. with one game it was an impossible intermittent fault to find but after I did a full mechanical rebuild its running well now (last resort option)

Actually I've had to do that with 2 of my EM's to fix recurring (and different) faults.