won't build air pressure pass 60 psi

I have a 2000 peterbilt 379 with a 12.7 Detroit that will not build air past 60 psi it has a new compressor on it and i have switch out the Governor with one that i know is good and it will build air to 70 psi now but will not hold it unless the truck is revved there is now leaks other than a small one on the transmission but it has been leaking forever. The dryer has a unloader valve in it but it has no governor that i know of

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