My Kubota B3350SU would not complete a parked regeneration. This is the first time since new I had any problem with regeneration with 700 hours on the tractor. I took the tractor to the dealer and the mechanic could not do a forced regeneration while I waited and left the tractor with the dealer. The next day the mechanic called and told me he talked with Kubota and they agreed the Diesel Particulate Filter and one sensor was bad. The mechanic said the parts were on order and would arrive in about a week. I picked up the tractor today and the there was no bill. Kubota paid for the diagnostic time, labor and parts.