I've had the same thing happen to me twice in the last two months. Each time the right rear tire was 5-6 lbs lower than the left rear. Each time I added air to get the pressures equal. I believe the system senses a difference in tire speed from when the system was last reset and when that difference is large enough the alarm is set. Resetting the alarm just tells the system to use the new tire characteristics and monitor from there.
Now what to do with a slow leak in my RFT.
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