maytag washer leaks

I just bought a used maytag neptune washer model number MAH8700AWW. when it runs I end up with a puddle running under the back of the washer. what could it be? I was going to take the washer apart but what should I check? what should i be looking for?

Hi,

I would remove the back panel and watch it during a cycle. It maybe leaking out the center of the tub in back behind the large pulley.

I checked out the washer, and it leaks bad behind the weight balancer. if you are looking at the washer from the back it is leaking from the top left. and it only leaks when it is in rinse mode and it spins constantly. not when it is intermittent and not when it is on spin mode. what do I need to fix?