Luckily, this is still covered under "power train" warranty which expires at 70,000 miles (whew, that was close!!) so says my service advisor at my local Lexus dealership. Prior to buying this pre-owned RX last December, I reviewed the CarFax service records. It had all the required maintenance service when due either by the selling dealership or a Toyota dealership. Guess that is no predictor for water pump bearing quality.