i have a 3 bay self serve wash and have been fighting an issue with spot free sticking on high pressure when switched from a hp rinse (1100 psi) to spot free (350 Psi) on rotary switch. when this happens in my #3 bay it drains my spot free 65 gallon tank pretty rapidly as you can imagine. the manufacturer of my spot free unit is no longer in business. Any ideas?? silenoids are all brand new. also if you click it to spot free first on the rotary it will stick on spot free pressure when switched to high pressure rinse, soap or wax, until switched to off, left off for a few seconds then switched back to a high pressure setting. if its not the silenoid on the spot free pressure regulator then where should i look?? thanks!!