We had a button problem with this model, water from soap drawer rots the keyboard membrane, it also can short making lcd go odd.
I fixed it with very careful soldering of 'jumper' wires around the rotted section.
If you want to do this, it takes hours and a steady hand etc.
I am looking for a manual for this machine / wiring diagram etc, or digital camera pictures will do etc of the wire connections on the boards (mainly the one with the transformer on) / water level switch.
lez, December 2005