I just purchased a 2014 5065e and have about 25 hrs on tractor and noticed gear whine in B3 and B4. These are the gears i seem to use 99 percent of the time, but have whine in other gears depending on rpm/ load. I run a 7ft heavy duty brush cutter, cutting hay 3 to 4 foot high and heavy. Running at 2300 rpms in b3 after hydrualics have come to full temps seems the gear whine is really bad, and gets worse when climbing hills/ putting load on gear drive train. Was going to let tell dealer and see what they have to say. Good luck with your repairs.