I am a new owner of a 2021 model BX1880. I have only had it for three days, with minimal experience. The first day of use was uneventful, but I noticed a strange loud noise coming from under the seat when in motion on the second day. I did not move the tractor far, checked the transmission, and it required two quarts of fluid—no sign of a leak externally. It was still making a terrible noise after refilling the transmission and looking for suggestions for troubleshooting.