PTN did "check the box" exchange to be treated as a corporation.

The PTN (TEEKAY LNG PARTNERS) a publicly traded ptn doesn't recognize the exchange as a sale, but did show this was a Final K-1. The K-1 Wks wants to treat this as a sale or liquidation with sales price, basis, and other sales information. Without answers to these questions, errors show up. Suggestions on how to proceed would be appreciated.