2008 BMW R 1200 RT Power Train Problems

I AM WRITING IN RESPONSE TO YOUR INVESTIGATION CONCERNING BMW MOTORCYCLE FINAL DRIVE FAILURES AND WISH PROVIDE SUPPORTING INFORMATION. I HAVE A 2008 BMW R1200RT (VIN [XXX]) IN WHICH THE FINAL DRIVE DEVELOPED SIGNIFICANT ROUGHNESS IN THE REAR WHEEL ROTATION AND PRONOUNCED RUMBLING NOISE AT HIGHWAY SPEEDS AT ABOUT 22,000 MILES (EARLY 2011). I CONTINUED TO OPERATE THE MOTORCYCLE UNTIL 23, 400 MILES AT WHICH POINT I CONTACTED BMW USA AND MY LOCAL DEALER (AUGUST 2011). AS MY MOTORCYCLE WAS A FEW MONTHS OUT OF WARRANTY, NEITHER ORGANIZATION WAS PARTICULARLY HELPFUL. IT SHOULD BE NOTED THE FINAL DRIVE LUBRICATION WAS CHANGED AT 12,000 AND 18,000 MILES SERVICE INTERVALS. NO METAL SHAVINGS NOTED WHEN THE OIL WAS DRAINED. AT NO TIME WAS FINAL DRIVE OIL LEAKAGE EVIDENT. BEING A MECHANICALLY CAPABLE INDIVIDUAL, I ELECTED TO DIAGNOSE AND REPAIR THE FINAL DRIVE MYSELF. I DISMANTLED THE FINAL DRIVE AND INSPECTED THE CROWN...