My Garmin inReach lasted one night on the PCT before I used it to prop up my tent at a windy campsite. Guess it's good for something, just not what I paid for.

Whoa, hold on there! I gotta respectfully disagree with calling that first guy a so-called pro. Seems to me like you're blaming him for a diagnostic issue that happens to the best of us. He checked the most common culprit first, the capacitor. That's step one in any cooling issue. You even said the temp was up to 50 degrees, that's a huge load on the system, so a weak or failing cap is a super logical first guess. It's easy to say "check the basics" after you know the answer, but in the moment, a fan motor that's dying can act fine but just be slow. I've been there where you swap a part that tests fine on the meter because everything else checks out, and it still ends up being something else. It sucks you lost the prep and the time, but throwing the tech under the bus for not instantly knowing a motor was wearing out feels a little harsh to me.