I have an mp10, it needs the bearings in the dry side to be replaced or you can send it in for repair, or replacement dry side is $111 from ecotech.
If you have it on more than 40% or so, it will get louder but still works.
Currently i have it running on constant mode at 40% and you cant hear it.
I'll sell for $100, you can come by and see it running if you'd like, or can send you a vid.
Mark
9542532299