Erics: thanks!! It is indeed a Prodigy TR/86 and with connecting the wires to terminal 1 instead of terminal 2 the machine works fine again (it stops heating when the boiler is at the right termperature).
Here is the adjusted wiring diagram for others to use:
Large version here: http://i.cubeupload.com/E9R6h0.jpg
Thanks for the great help guys!! Now it's time to dial in the machine and enjoy great espresso's once again .
Equipment doesn't work? Troubleshooting? If you're handy, members can help.