2009 LEXUS RX Power Train Problems

WATER PUMP FAILED ON 2009 LEXUX RX350 AT 61500 MILES AND JUST 4 MONTHS OVER THE POWERTRAIN WARRENTY. LEXUS DECLINED THE CLAIM. ENGINE OVERHEATING CAUSED HEAD GASKET FAILURE AND WARPED CYLINDER HEAD. 1.AS PER LOCAL MECHANIC WHO REPLACED WATER PUMP , THERE WERE INDICATION OF COOLANT LEAKING FROM WATER PUMP SEAL AND IT MUST BE LEAKING FOR QUITE LONG TIME, EVEN WHEN VEHICLE WAS UNDER WARRANTY. THERE WAS ENOUGH VOLUME OF COOLANT WHEN THIS INCIDENT HAPPENED, INDICATES THAT LEAKAGE WAS VERY MINOR AND MY NOT APPEAR ON THE FLOOR WHERE CAR WAS PARKED. 2.WATER PUMP IS PART OF POWERTRAIN AND HAS NO DIRECT INFLUENCE OF DRIVING PATTERN. FAILURE OF WATER PUMP AT 61000 MILES IS VERY PRE-MATURE AND INDICATE TOWARD INHERENT PROBLEM WITH WATER PUMP QUALITY. 3.SAFETY ISSUE: THERE WERE NO SIGNS OF WATER PUMP FAILURE UNTIL LAST MOMENT WHEN IT ACTUALLY GAVE UP AND CHECK ENGINE LIGHTS CAME UP....