My wife came home and said that her R57 was showing the tire pressure low. Inside the door is shows 39psi, that seems high to me. All 4 wheels were at about 32 psi, so I set them all to 39 psi. It still showed all 4 tires low. she drove it and said that it showed all 4 low then finally said only one of the rears were low. then the warning went out. Any ideas? Could all 4 of the pressure sensors batteries be going bad. I still have not got a Bentley manual for it, but thats ok I have MA!