I was told that they planned to replace the rotors and rear bearings plus rebuild the nose drive on principle - even though the nose drive was fine, it sounded like they were replacing the front bearings and the coupler. I asked about the case since there was a lot of bore scoring. It did not seem like they wanted to replace the case. I expressed some concern and was told the blower would be bench tested before it was released as repaired ok. You can bet I'll be looking at the serial number on the case when it's returned and will pay close attention to generated intake pressure when it's installed. Maybe the rotor tip to case bore clearance isn't as critical to performance as the clearance between rotor tips and the root of the rotor. We'll see how it performs after the repair.

Frank