Dont.
This one is three years old. It failed within a few weeks of purchase the shop said 'pressure switch' and fixed it under warranty - or did they?
Last week it started getting 'lazy' with restarting after having switched itself off.
So stripped it to get the pressure switch off. It's a simple enough assembly - mainly plastic - screws into mazak housing. O-rings seal it.
I managed to get *most* of it out but damaged the housing in the process.
So that's a new housing was well. Half the cost of a new washer.
German Kunts