Hi everyone, first post, grateful for any advice.

We have an old Bezzera BZ99 built before 2001 (ours for just over a year). Nice old machine makes great coffee, very happy.

But recently it would flip the safety switch, outside on the powerboard, for the power circuit when the pump built up pressure. Must be shorting, no visible leaks inside when looking with the cover off.

All other functions and circuitry is working fine.

Does anyone have suggestions about what needs to be replaced? Guessing it is the pump or three way valve/solenoid?

Thanks in advance. Rob from Melbourne.