I have a 6420 John Deere with the power quad plus transmission. (24 speeds) After 4 to 5 hours of use the warning lights will flash and the monitor says check transmission oil or change filter. We serviced the transmission 150 hrs. ago and the oil level is full. The transmission continues to shift and work smoothly. Could we have a bad transmission pressure sensor or what should we look into to fix the problem.
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