Miele Dishwasher - dispensers and fan stopped working

I have a Miele G868 dishwasher, which is maybe 25 years old at this point, but has worked pretty well (with a few minor repairs), running on average once a day completely full. We do clean out the action parts regularly, and they still are in pretty good condition.

The fan stopped running during the drying cycle, then (or maybe simultaneously) the soap dispenser stopped opening + the jet dry stopped dispensing. I replaced the dispenser component (an easy fix I've done before with a $30 part), but that didn't fix the issues.

So my question is, what might be next to try? I'm fine with doing a bit more troubleshooting, but I'm not a good electronics guy. So if it is likely something expensive like the electronics control board that finally pooped out then maybe I should quit now and invest in a new one at this point (which I'm fine with)?