If the borrower writes a nasty letter and disputes the value and threatens 18 different kinds of repercussions, but does not identify a referee, that does not qualify as a legally valid dispute for purposes of redemption.Once the borrower names his referee, the current owner has 10 calendar days to name his own referee.  

You as property owner are the landlord. service should be listed as you as emergency contact for power, you would be notified if power would be shut off and at that point service is reverted to owner. lapse between tenants would be billed to you.. you send in start / stop  order to power company for your tenants, and the unit is never threatened to not have service. 

But when someone starts threatening and other people start complaining...now I'm concerned...Best,Mike

I only had one window to show it with the renters.. yes I am aware I could have posted a notice which I did on feb 10th but they threatened me and I decided to back off.  

I had one guy threaten to sue me if I didn't pay.

The original roommate has caused much disruption here, between her alcoholism and related violent outbursts, to her drug use and threats, including calling the local police multiple times for a variety ridiculous things, all of which is documented, and more than once was told by the police she was becoming a habitual caller and a nuisance, then threatened with arrest.

Other tenants have called the cops on her for threatening behavior. 

The title insurance company threatened lawsuit against the legal firm handling tax sales for the county.  

Or, have they threatened that the lien is coming?

If she feels threatened by this, it is a good indicator that her future ability to pay is limited.