Hi, thanks for using JustAnswer.com. Please remember, I do not get paid for my time and expertise until you accept. Open the door and lift up on the INNER tub and see if it knocks when you lift it up and down.
The tub support is part of the entire tub assembly, number 16 in the picture. You will also need to replace the rear half of the tub. Both part together will run around $450 and I can get you the service manual if you would like to repair it!