What is making my MP-40 dry side noisy?

Even without the wet side attached, the mp40 dry side makes noise. It's not even a year old. Any idea?
Here's the video
If it's not even a year old contact ecotech it should still be under warranty. It sounds like either a bearing is hanging up or something broke loose inside and is knocking around as the magnet spins.
 
To my knowledge, it wasn't dropped. The last time it was even touched was a couple months ago when I cleaned the wet side. It's been running pretty much 24/7 since then and all of a sudden started making noise. Frustrating. At least I have another one on the other side of the tank and a cheap Jebao rw8 next to it that still functions (and outlasted it).
 
They sent me a "new" dry side. It looked used to me but it's silent. Provided mine wasn't dropped or flooded (which it wasn't), it should be under warranty.
As luck would have it, while I was putting in the replacement, I adjusted the other one I had and accidentally knocked it off the tank. Now IT makes a slight noise!! SO frustrating! That is on me and I'm not going to try and have it replaced. Anyone know how easy or possible it is to replace the bearings on it?
 
I have done that before, there are a couple a videos in YouTube that shows you how to do it, the important part is to identify the correct bearings for your model. Depends of the year they used different bearings sizes. That’s what happens to me on my MP10.
 

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