My tire pressure sensors seem to have a reading problem. The fronts, stone cold (overnight sit) read L 31 R 34, and rears L 31 R 37. I realize tire gauges are not super accurate, but the pressures with a gauge read the same (30) side to side on the front and the same (33) side to side on the rear. Anybody got a guess what's going on with the sensors? I had a switch in the system replaced (under warranty) a couple of month ago, and the tech supposedly "taught" the new parts everything they need to know. I adjusted the pressures a couple of days ago, and I've been through 20 or more key cycles since. What am I missing? Thanks for the help.