Today I received a low tire pressure warning on my dashboard. What was unusual is that I recently let out air from my tires because the dealer had sold me the car with pressures of 50. After a month of driving around that way I realized the pressures were too high and released air to a pressure of 39 in each tire (about 5 days ago). I checked the pressures today with a professional longacre pressure gage and they are all identical (39). Anyone have any idea of why this warning message came through?