after short sale what do I do about HELOC

I did a short sale on a home end of January 2010. There was a HELOC on the home from B of A the balance is 77,000 My question is should I call them and inquire on what we can do or wait for them to send me some form letter asking me to contact them? I could probable afford to send them 500.00 a month in payments but I could not come up with any more then about 5,000.00 in cash. If they would take payments with no interest this would take almost 13 years to pay off. Or should I talk to a lawyer?

Thanks for any help.