I think I just had my SAP issue figured out. I was getting codes for low air for secondary pump and it was very loud. I replaced the tube that goes from the pump to the valve, issue persisted. I then replaced the vacuum hose connected to the valve which got baked since it was routed above the exhaust manifold. Whoever designed that should be shot. I also replaced the salmon colored relay in the E-box. It's the 3rd day and the code has not come back.