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What I would start with are the known bad valves namely the 3 valves under the driver side cab. I had one truck that bypassed air through the parking valve, while there were leaks through out the system. Once I replaced the valves the park brake stopped bypassing air.

there are 3 under the cab, driver side.

if it leaks enough for the pressure to be ~50lbs I can see it as the park brake valve needs pressure to stay engaged.

That looks like one of the 3 membrane valves. I bought new shuttle valves and replaced the membrane valves completely. You can choose between a diaphragm valve as in the LMTV KN25060 Repair kit for diaphragm valve RN11V or a shuttle type valve as in the MTV KN25061 the shuttle valves are used in...

I can provide you with the kit I have

Yes it is rebuildable and I have a spare kit from when I did mine

I say wait until you get the truck there , maybe it's something really simple to fix. Although these trucks are in the parts-picker's lane for a reason. It usually mean that motor pool looked through the TM and didn't find the problem in accordance to the TM. Good thinking on having her...

I agree, they are great deals. The irony is that everyone thinks they go and flip a switch and dive her home (cuz it's like an adventure)- then they find out that flat bed towing is really really expensive. Good luck to the OP