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If the motor checks good and the drum is locked then either the front drum support has worn out or the rear drum bearing is worn out. These laundry centers are an absolute pain to work on so to even get inside the dryer the top sheet metal panel will need to be removed, then the angled panel between the washer and dryer, then the control panel, and finally the front panel. Once all those panels are removed you can remove the drum and try to see what's causing the drum to lock up.
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