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If the washer only makes the noise when spinning, that is an issue with the main tub bearing. The main bearing and seal would need to be replaced because the bearing goes bad due to the seal above it beginning to leak. Below is a link to both parts you need to order and replace to resolve this issue which on these stack washer/dryer units is unfortunately quite difficult to access and work on.
CLICK HERE for bearing
CLICK HERE for seal
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