When you are pressurizing the aircraft on the ground, remove the inlet duct from the ram-air valve before starting the engines. When you get the aircraft pressurized, see how much air is blowing out of the valve inlet. If it is a lot, the butterfly seal in the valve is gone or deteriorated and the valve must be replaced.
This is also a good time to check the regulating pressure on the Fluid Pressure Regulating Valve. If it is low, the air cycle machine will not see enough inlet air pressure to come up to the correct speed.
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