Was told that they could work on Diesel vehicles by a friend of a friend but ended up not being the case.
After being told my ECM was fried, I bought one for $600 bucks. I was told that if I ran it for a few hundred miles it would work better.
It didn't, so I Ended up taking it to Super Duty Shop to get a second opinion... the techs there told me I had TWO bad injectors and that my old PCM was completely fine and not burnt.
I'm sure Paul's auto shop does well with gas vehicles but if you have a diesel truck/van I'd suggest you take it to a diesel specialist. Some one who can run basic tests such as a "buzz test"