Looks like 4 nuts to remove the drive shaft. Don't know what happens after that.
Ordered the fan from the dealer. got here in just a few days. 15 bucks. Took about an hour to replace it. Kind of tight quarters underneath and was working with 1/4 inch drive stuff. The only big problem was trying to keep the shaft from turning when tightening/loosening the bolts. Screwdriver in the nuckel is what I ended up with.What does it take to replace? Had 7 hours on it and ran a stick into it. Had muffs on and didn't hear a thing. Took all the blades off it.