sounds like a touch pad, moisture gets in between the layers on the back causing intermittent switching
you can probably get one from coffee parts,(depending on which model it is) there is at least 3 different touch pads)
otherwise you will need to talk to the importers in concord nsw
the other i guess you are talking about the over pressure(safety) valve on the top of the boiler
try cleaning or lightly sanding the seat, when these are reinstalled you need to reset the pressure setting.
sometimes the best way with these is to replace it with a new one. see coffee parts for this