In my opinion, the answer is NO to both questions.
I am assuming that the buyer is neither insolvent nor bankrupt.
The reduction in debt for your seller financed purchase money mortgage is treated as a reduction in the purchase price the buyer paid for the property. There is no cancellation of debt income for the buyer, so no 1099.
You also don’t have a write-off, either. However, since your sale price is reduced by the amount of your debt reduction, you may be entitled to a refund if you paid capital gains taxes on the higher sale price.
See IRC §108(e)(5). Consult your CPA for specific details