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650 ISX Cummins failure

Yahoo Message Number: 99842
Anyone else with the ISX 650 that has had a broken valve out there?
 Bought the Magna with about 42,000 on it. Paperwork shows a broken valve on #6 at 19,032 miles in 2010 also included a new turbo.
At 20,XXX a new turbo was installed At 44,XXX the engine again dropped a valve in #6, which damaged 4 and 5. repair estimate is almost $29,000 and, again it includes a new turbo. Cummins NW has seen 4 of this failure, two on class 8 trucks and now two on motorhomes.
Cummins says it's a known problem and they have new heads and valves to address the problem.

Just wondering how many others have had this happen.

Deen

2009 Magna #6999 ISX 650