2008 S40 2.4i - Got a "tire pressure monitoring system requires service" message come up today. It constantly flashes an orange exclamation point in the lower left of the diplay (not the brake "!" light). I don't have a pressure gauge to measure at the moment, but I assume by the message, it means the monitoring system is at fault and there is not a low pressure reading detected, correct? None of the tires are visually flat.