I notice that the RPA audible alarm only beeps when an object is within 1 foot of my rear bumper (the warning lights do progressively lite up). On GM Techlink, there is a notice (dated June 1, 2008) that this was improved to 2 feet for the 2009 model year on certain vehicles and that a calibration update would be available for some previous model year vehicles including the SRX. I have a 2007 that still has a tad of warranty left. Has this recalibration actually been made available for our vehicles? If so, should it be covered under warranty?