Looking for repair manual

My Holmes HAP702 air purifier just shut down after running almost non-stop for 5 years. I tried finding a repair shop near me, but the only non-cellphone electronics repair shop that I found was a vacuum cleaner repair shop that charges 50 USD at a minimum. A replacement air purifier that's compatible with my stock of air-filters costs a bit less than that after shipping and taxes.

I thought about fixing it myself, but the only manuals I could find for it are user manuals, which aren't much help when trying to fix a discontinued unit.

I read that if the fan is hard to turn, then the motor needs to be replace, but after taking it apart, I'm able to see that the fans still spin freely.

I was hoping that someone could point me a repair manual for this that might help me figure out the issue. I'm going to start poking around the insides two days from now. I would do it tonight, but I want to give the capacitors plenty of time to drain.