Aaron - You did not mentioned what BK you filed and discharged from. However, since you mentioned you want to "...negotiating to reduced payoff of a 2nd mortgage". So, I assumed you filed BK7 and get discharged.
Because you received a discharge in your Chapter 7 bankruptcy and (I hope) you did not reaffirm the 2nd lien, the lender no longer has the right to sue you to enforce its lien - the 2nd lien is attached to the property. The good new is you no longer personal liable. And the bad new is, if you stay in the property you have to pay the property debt.
I believed in your case, the originated lender may have written off the loan from their book and sold the 2nd lien to another company. The "new" collection company now owns the lien and the lien is still attached to your property.
This could be a good news for you now that the loan is with the new company. Since, the bank sold the lien pennies (plural) on the dollar. You may be in a good position to negotiate either a reduced monthly payment or a settlement on discount payoff for the 2nd lien balance.
Disclaimer, I investing in 2nd NPN (Non-Performing Note) . Thus, I am somewhat familiar with the workout process with the HO like you. Well, feel free to reach out to me directly when the new 2nd lien holder contact you, or if you have any questions, and I can give you some tips on how to negotiate.
PS: Yes, the new 2nd lien holder can FC on the 2nd position.
Good luck!
Cheers,