The other day we were cleaning our machine for basic maintenance and we had turned our espresso machine off, but when we had turned it back on the machine would not regulate the pressure properly. Every time I set the machine to the boiling setting the pressure goes into the red zone and pressure is released for the safety release valve. What are the symptoms here and what are the possible parts i need to replace? I was told the thermostat that regulates the pressure might be bad, or possibly the Microswitch? Please help, thanks.