Good afternoon. In the middle of a cut, the pressure dropped from 60,000PSI to 20,000PSI for no apparent reason. I have shut everything down and brought it back up but it will not develop the high pressure. I select "auto" in both positions on the controller, then hold the low pressure button until it lights. Then hold the high pressure button until it lights. Pressure goes to 20,000. When I hit the low pressure button again to tell the pump to go to high pressure, nothing happens, pressure stays at 20,000. Any help will be appreciated!