Unfortunately, that is part of the problem.
The shop i go to is a very good shop ( I am very comfortable with them) that not only work on their 30 or so rigs, but does a massive business with other truck companies and owner operators however, they are not affiliated with any one company so for specific diagnosis, I have had to take the rig else ware and in this province, if you own a legacy Freightliner truck..Freightliner really doesn't want to deal with you. The one small problem i have had, i took it into a Freightliner dealership about 900 miles away..
So i have found that if I do the research, it really helps them...
Thanks...the search continues..