Purchased my '07 on thursday night, on the way home the tire pressure system malfunction light came on, not the light to tell you that a tire is low on pressure, but the one that tells you the system is malfunctioning. I visited the dealer on saturday morning and they checked the tire pressures and reset the light. On the way home it came on again, the dealer says he can find nothing wrong with it, then he gave me a Hyundai service bulliten stating that outside temperatures can make this thing act up.It's about 40 degrees I wonder if this thing is going to be more trouble than it's worth.It's not supposed to go on unless there's a dramatic drop in pressure of at least 25 percent.Any ideas?