I Found It!
After looking through the Prevostcar website several times to no avail. I call Jim Malcomn, Prevost Texas Region Service Manager, he pointed me in the right direction and 'like magic', we found it.
The link below goes to the pdf file with the modification information.
http://www.dreamchasers.us/pog/Sb96-14B.pdf
Another bit of information I will pass along. The device that in mounted on the inlet air line to the aux air filter/blowdown bowl (mine is gray color) located in the lower cabinet, below the drivers seat is not a regulator. It is a pressure protection valve that will not pass air unless the aux air tank (inlet) is above 75 psi. Its function is to maintain at least 75 psi in the aux air tank for braking. If you had a failure in a aux air component, the pressure protection valve would close once the aux air tank was depressured to 75 psi. Imagine that!
Hector
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