Terry,

As you can imagine the coaches are complex. Problem solving, even for those professionally engaged in the business is made more difficult not only due to the number of Prevost design changes, but the wide variety of converters, and the number of design changes they also make over the years. As if that wasn't enough to frustrate almost anyone, there are the "upgrades" or owner requested changes over the years and the probability little of all of this is documented or easily accessed.

Any of us can guess, but until we are at the coach and can actually identify what we are dealing with (and even then) we have nothing but our educated guesses.