Neptune stacked washer bearing going bad?
 

The washer, in it's high speed spin cycle, has gotten really loud in the last few months. Could this be a bearing going out and if so, which one would it most likely be?

Yeah, it probably is the rear bearing, and there are several thoughts here.

Having wrestled a few of these machines, and given their other problems my advice is to replace it, but given that yours is an expensive stacked machine and replacing it means a new washer and dryer, or combo, you may want to think about a repair.

Here is a set of posts which describe the process. Yes, it is a lot of work, most of it hard and frustrating, and no I don't recommend it unless you are really skilled at tools and repair but if you want to give it a shot these posts will take you through the process.

http://forum.appliancepartspros.com/...-tutorial.html