As a FSBO you should call an attorney. There are legal questions you will want answered.
I have helped several clients who have done a short sale only to find out they are still on the hook for the second loan.
For the same amount of money dealing with an Attorney / Broker is an excellent idea.
Depending on the type of loan and balance you are defintaly sered by calling an Attorney who specializes in short sales.
Volo Law / Legal Realty
925 699 5041