Tire pressure/temperature rise

[Bourbon County]

We just returned yesterday from a camping trip and saw some puzzling readings on the TPMS. I only have readings on 3 tires since the spare was on the L/H front. It was put in service due to a flat along the way and I didn't take time to put the sensor on.

The R/H rear is where I saw the puzzling readings. The other 2 tires had built up to 85 and 81 PSI, and 84 and 85 degrees F. The R/H rear built up to 88 PSI and 95 degrees. It was a very mild day and outdoor temperatures were in mid 60s, I very rarely drive over 65-70 mph.

I'm very conscious (actually totally anal) about tire care and had all 4 inflated to exactly 80PSI before I left. I checked on a 75 degree day with a very good pressure gauge. Even though it's a cheap model, my TPMS reads very accurately in comparison to the gauge. I run Goodyear Endurance tires.

Am I possibly seeing warning signs that a wheel bearing is going out? I actually own a small thermal camera and should have taken some images, but it was raining when we got home and rushed around to get unpacked and failed to do so.