I have a 2009 RX 350 with only 78k miles. New tires last yr, but after 6 months had very slow air leak on one of the tires...maybe 2 lbs week. Went to Tire shop and they found interior, alloy wheel corrosion causing leak. They sanded it down and leak has stopped. But now having slow leak from 2 other tires. Assume this may be same problem. Is this common for 10 yr old Lexus....low miles. Do I need new wheels, or can wheels interior be repaired?