Hey guys, I installed my Harman p52i back in 2014. I love it, except for the intermittent sounds it makes. Last year I swapped out the combustion motor thinking it was bearings, and that did fix the issue, but this year I started it up and behold, sound is back. Because it's such a pain to pull out, I have to wait for a decent weekend to swap the motor out. Link to install if needed; https://www.hearth.com/talk/threads/harman-52i-install-let-me-get-this-right.125196/ Recently I cleaned it, and cleaned the fan blades on the combustion motor really well, and what do you know, sound was gone. So now I know it's the fan blade itself. This was short lived, and the sound came back withing a few days, so again last Friday I cleaned it again, this time removing and really getting it cleaned. This made things horribly worse!! I must have removed and adjusted that thing 50 times before I got it to sound right. Finally at some point it did the trick and all was good.....until last night? We were watching a movie (pellet stove sits ~ 3' from the tv) and I started to hear it every so often. My wife say's she doesn't notice it until I point it out, but in my defense I'm closer and I'm always listening for it because I know it'll only get worse. I'm at a loss? I've put the fan blade on a flat surface and tweaked everything so all the blades line up and then it was worse than it's ever been. Used vinegar and a brush to clean it to look new, no good. The only thing I did to get it quiet was just keep adjusting the blades while installed in the stove...open, adjust blades, close, test,..... open adjust blades, close, test...... If I look at the fan blade, there' physically nothing wrong with it, and I can get it to be quiet, but at some point it starts to make noise and my experience is it just gets worse. I'm all ears to any suggestions? I can spin the motor freely with my fingers and there's no gritty feeling or slow down like when a bearing is out, so I'm 99% sure it's the fan blade. The only thing I can think of is days of heat throw it off balance, or it gets dirty, but the sound stays after I clean it and the only remedy thus far has been to "play" with the blades themselves (pushing slightly in, or pulling slightly out). I know a new blade is like $20 online, but I wanted to run this by you guys first and to see what you think? Hope everyone had a great Thanksgiving!