Thank you zip439 for your response. I did check vacuum at the switch over valves when the pump went off, there was no vacuum. I also checked the the air pump pressure at the switch over valves, there was pressure at each.

I also called the company that installed the the used switch over valves, they told me the mechanic replaced the valves with the 20year old gaskets, obviously I was concerned as I had told them I had new gaskets. Could this possibly be part of the problem.? I have a meeting with them this Thursday . Let me know what you think.
Thank you,
Normt18101