Id also inspect the shaft on the wetside.
Might be cracked, exposing metal. And it would be noisy.
If all these fail, theres bearings that eventually wear out in the dryside. But i have a pump thats 10 yrs old still all original besides wetside.
Youd have to DIY. Its technically not replaceable but theres threads around with good writeups.Yes. All modes. That video was on constant speed.
Where would I get a new bearing?