You would start a lawsuit with John Deere over paint chips on a loader frame?? You and I are cut from different cloth.
Why not if you missed one payment about equal to the cost of the paint on the loader they would come and take the hole tractor. To me that means it’s worth the trouble and I would bet once they get that letter from your attorney stating ifva reasonable solution isn’t reached within 30 days thier legal team would recommend the fix it. Most likely cost them less to fix it then defend the case in court or deal with any possible bad publicity.