A new type of engine mount and oil tank was installed and approved by a previous 337 form from Travel Air 6B NC9038, SN839 owned by Johnson Flying Service (now owned by Hank Galpin of Kalispell, MT). A new prop hub and blades were assembled and installed as well. The engine was overhauled and the parts magnafluxed and reinstalled. MAFM has the original 337 form. There was also a new engine operating limitation issued.