Tire Valve problems of the 2009 Jeep Patriot

I have a vehicle with a tire pressure monitoring system. Two tire valve stems are cracked and one has a slow leak. I have read of others with the same system where the valve stems simple break when hand washing the car and the tire goes flat in seconds. This is a serious hazard and could kill someone if it happened on the highway. It is outrageously expensive to replace these stems.

While servicing this customer's vehicle we put an a tire inflator on the vehicle's valve stem. The valve stem broke and was very brittle. The tire lost all air pressure and needed to be repaired at a tire shop for $138.