Yeah, Mark's boxes were well built! I remember back in 2014, or so, I thought there was a problem with my PM3 and gave Mark a call. He said to send it in and he would put it on your guys test fixture and see what's up. He ran it for 24 hours on full power and it was fine, as to be expected! He never charged me anything for it and the problem wound up being my solder joint on the pump wire had fractured and would sometimes cause glitches. At the time this box was probably 15 years old and he tested it for free, that's the kind of guy Mark is.
