mfg date of 08/03 the upper feed auger is locking up and won't turn. if you take the motor and move it up and down and loosen it, it works for a few minutes and locks up again. I removed the upper auger and gave it a good cleaning but it didn't help. I did a reset on the board just last week. mode D 5-4-1. the auger motors I have never changed I've owned this since 2013. any suggestions what to try next?