Two points. One for the actual work plus one for using good troubleshooting techniques & explaining the process so well. Good job!
Side note... when replacing fans like that I strongly recommend spending an extra dollar or two for fans with bearings. They are much more reliable & longer lasting. Not sure which those are, just throwing it out there for general FYI to help anyone who might be in a similar situation.
Without subsidies, chem-ag food costs four times more than organic. Or this tiny ad:
the permaculture bootcamp in winter (plus half-assed holidays)https://permies.com/t/149839/permaculture-projects/permaculture-bootcamp-winter-assed-holidays