TCM came out with a critical service bulletin CSB-02-2B on the TSIO 550
(and others).  The is to inspect for oil leaks at the starter adapter.
Fracture of the shaft results in failure of the scavenger pump to return
the oil from the turbos and loss of engine oil with failure of the
engine.  TCM reports 7 failures of this part.  I believe that 3 of those
have been in Lancairs.

Engines less than 250 hours are included in the bulletin.  The 3 that I
have heard of all occurred in less than 50 hours.

I can inspect mine with a flashlight looking up through the right
exhaust cowling space.  

For detail go to:
http://www.tcmlink.com/aviator/AVI-serviceBulletinFRAME.html

Carl Cadwell
N25CL IVP with 235 hours.