I contacted the dealer and they agreed that 16,600 mile was not a time for a water pump to fail. The car is used twice a week and sits only 3 days between trips. The car is moved about 5 days a week from the garage so it wasn't just sitting not run for 8 years. They agreed to fix the water pump, timing belt, and flush the system. They found the timing belt had lost tension prior to the 11 year mandatory replacement regardless of miles. This could have been far worse the belt could have failed wiping the top end. I have found Lexus to go above and beyond to make things right. They have fixed several minor issues over the 8 years we have had the car, as they weren't suppose to fail either.