Common culprits include poorly sealed wax rings, dry traps from leaks or non use, and localized clogs that vent sewer back into the room. 

I own and operate a local firm here in Green Bay.

Local investor and investment focused mortgage broker in Middletown.

I am an agent and investor in the area and I'd be happy to connect and chat more about strategies and the local market. 

If they treat you like the existing owner:The tenants would pay between 1st and 5th give or take (depending on local laws about when rent’s really “due”.

Given that it's an ADU and you are an owner occupant I would courteously terminate the lease (the how on this is going to depend on your local laws and your lease) and get a new tenant ASAP.

Check with some of the local REIAs to see if there are any interested buyers, have the host blast out an email to all members.

To find the right lender, check with local real estate groups, mortgage brokers, or online platforms.

I would reach out to local banksThere are some non bank lenders who may lend on it but would want to know condition, use of funds and other info.Happy to run it by some of our lenders

It would seem like investors would want the conference here...more "local".