See if they want to buy it off you

I just pay my accountant a monthly fee

#11 you really asking how they get revenue? It’s a business

Definitely ask for a auditor to review it just prepare to send a decent amount for the auditor

#4 does not matter as you would need your own insurance the policy does not carry over

The undisclosed debt has nothing to do with you unless they never signed a personal guaranteed if they did they are on the hook.

Definitely number two about any lawsuit as that can become a problem in its self. I know from my friend who a business litigation attorney and he dealing with a complex case from one of his clients who bought a business with a lawsuit pending that keeps reopening everytime they come close to closing.

Get a business lawyer to contact them and send a demand letter