Fisher and Paykel Ecosmart Washer Noise

This is a really good washer. I've had it several years. All of a sudden it started making an intermittent squeal while running. It's pretty loud.
At first I figured it was a weak water valve vibrating, so I closed the water taps while it was filling (I don't know if the pump was running at this time.) Still got noise.
Then I noticed it making noise when just the pump was running and it wasn't filling.
Later I noticed noise when it was filling with no pump, so I grabbed the tub and kept it from moving. A long shot (the noise sounded like it was fluidic in nature), but the noise was unchanged.
I'm relatively mechanically inclined, but this one is bewildering.
The only quibble I have about the unit (noise aside) is that sometimes I want to wash something for a long time in really hot water -- perhaps to shrink it. This machine, having an Energy Star rating, won't allow that. Otherwise, I think it's a really good washer.
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