There are lots of possibilities, but 95% of low-power complaints that I've encountered were solved by fuel filters, an air filter, or a turbo boost pressure related problem(Charge air cooler, hoses, etc.) Since your truck gets serviced regularly, I'd check the turbo(make sure it spins freely), CAC, and all the hoses. Don't forget to check the small hose that goes from the bottom of the engine intake manifold to the air compressor intake. It's just a heater hose, but it's used for the compressor air intake. I've seen a lot of detroits lose their boost pressure there.
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I think the devil drives a T2000.
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