Miele dishwasher

Miele dishwasher does not dry dishes

Sounds like it needs a new heater relay.

Here’s a video on how to get to the part:

https://youtu.be/BDSoCYcwsVM

Miele incognito with f78 light sometimes flashes. Sometimes water doesn’t fill, sometimes it does. Repairman said motor bad but it works fine sometimes, then not at all other times. Diagnostic said computer was fine. What’s going on?