A possibility. Check & empty drain hose. Disconnect both ends. flush it out. Reconnect and pour in strong water/bleach mix in hose. It may run get back in the water pump & help kill odor. Seems like a mold or rot problem somewhere. It could even be a sock or something somewhere i the agitator or it's "piping." Last thing I would do. fill washer with a bleach mix in the washer. Let it soak a day. Then add bleach. Move it to rinse setting. When it starts to pump out water shut it off and let it soak the water soak in the lower system. Good luck. They were good machines then.