Waddington Inc. owned all of the outstanding stock of Convington Co. The subsidiary had bonds payable outstanding on January 1, 2020, with a book value of $270,000. The parent acquired the bonds on that date for $291,000. Subsequently, Waddington reported interest income of $26,000 in 2020 while Convington reported interest expense of $31,000. Consolidated financial statements were prepared for 2021. What adjustment would be required for the retained earnings balance as of January 1, 202