If you are not comfortable with high-voltage electronics, stop and call a professional. The service manual is for guidance , not a substitute for electrical safety training.
A single service call for a Miele can cost $200–300 just for diagnosis. Using this manual, I fixed an F70 error (heating fault) by testing the thermistor and finding a broken solder joint on the main board. The part would have cost $400 new—I fixed it for $0. Another user traced an intermittent drain error to a clogged pressure switch tube, not the pump. Miele Service Manual G560 Dishwasher