Mine began to whine a year back. Instead of simply replacing, you can take apart. There are (2) sealed bearings (Oh No sealed bearings) inside. They can be re-packed with grease and that stops the whine.
Removal is very straight forward. Check the the (3) mounting bolts. They are Rubber glued to threaded shafts to reduce vibration. I had one un-glue. These (3) mounting bolts should be replaced. - Part #3
