Here's a few for the list, Mark,
1. Stock turbo bearings collapsed & took out apex seal. Flew home at reduced power.
2. Fuel filer (sinstered bronze) looked clean but was restricting fuel flow. Flew home on other tank.
3. Bad / intermittent contact on ignition timing sensor made engine run rough. Landed normally and repaired.
4. Turbo hose blew off on take-off. Returned to land at reduced power.
John