I just received my 2018D that LGB installed a 55021 decoder in. Everthings works well with a minor issue with the assignment of the Smoke to function #1. This is the second 2018D that I have had LGB install a decoder in the last three months. The first 2018D installation, LGB assigned the smoke to function #7. It seems that LGB steam engines use function #7 for smoke. I would like to change to function #7 to be consistent with my other 5 engines. Can this be done and if so how? Which CV?