There is a CD available for the Workhorse chassis. It's a complete parts list, which I think is model, or perhaps even unit specific. You can get it through the Workhorse Chassis Motorhome Association, which is an FMCA affiliate.
Jenn & Pete
2006 Crescendo 8356 purchased new
Cummins 330 ISC
Toad: 2015 Jeep GC Summit