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There's a separate air horn circuit.

The cover comes off with two torx screws under the steering wheel. Loosen them completely and jiggle the cover a lot. I've seen a number of older trucks have the horn ring contact wear away enough to stop making contact.

If it's got black smoke coming out of the tailpipe, the DPF is toast. The injectors deteriorate, over fuel, and the excess fuel causes DPF meltdown. There's more to it than that, but visible black smoke is pretty damning

There is a hydraulic fluid reservoir at the left rear of the engine bay for the booster pump. The reservoir stains and is impossible to see the actual fluid level through the gauge on the reservoir. This reservoir gets Dexron III atf. It'll alarm if the level gets low. Pumping the brake pedal...

There is not a dedicated trailer wiring circuit. You'll have to make your own.

Does oil still spew from the dipstick with the oil cap off? Sounds like a crankcase ventilation problem. VNT problems won't cause this.

Most of the time when the cruise doesn't work, it's from some underlying problem, like the brake switch is stuck on, the exhaust brake is left on, or there's an ABS light. Other times it doesn't work because spilled drinks have the buttons stuck, or maybe the switch isn't even plugged in.

Sometimes the 2005-2007 trucks develop EGR problems that you can see with software (the valve can't be commanded through its full range of travel) yet it won't set a CEL. The symptoms for that tend to be terrible acceleration off the line but seemingly normal power at higher rpms. Since it's at...

There's a couple air switches under the truck, but only one is a brake switch. The other brake switch is in front of the brake pedal. The inputs of these brake switches both have to correlate.

It looks like water intrusion causing corrosion.

Are any warning lights on, like the ABS or check engine light?

I'd take that cover off, disconnect the connectors, and blow everybody thoroughly compressed air. Make sure all five clips on the cover engage when you put it back on.

I know that's not the conclusion you wanted, but I'm glad the problem is solved.

Have you driven through rain recently? Water can get in the firewall junction box behind the engine air filter and cause communication errors with the transmission.

Those pressures are plausible. Is the cabin air filter present? If it's not, I'd suspect the evaporator fins are clogged.

With the truck cooled off some, take off the cap and start the engine. Are bubbles coming out of the radiator neck?

On Hinos, it's almost always always combustion gases in the coolant, or external leakage. They rarely mix fluids. If you're getting transmission fluid into the coolant, then it's coming from the transmission cooler inside the lower tank of the radiator.

There isn't a separate lift pump (unless you are referencing the hand primer pump)The high pressure fuel pump has two pumps stacked together. I'm suggesting the elimination of the entire fuel supply system and connecting an auxiliary fuel supply directly to the pump.

If transmission fluid is in the coolant it can only come from the transmission cooler inside the radiator., or someone poured it into the radiator.

It's not a normal failure at all. I don't think I've ever seen this failure on a Hino