As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) TROUBLESHOT NO RPM INDICATION. REMOVED TACH GENERATOR FROM RT ENGINE, DRIVE SHAFT WAS STILL STUCK IN THE ENGINE. IT APPEARS THAT THE SHAFT SEPARATED FROM THE ARMATURE INSIDE. REMOVED THE SHAFT, NO DAMAGE TO THE ENGINE DRIVE. INSTALLED SERVICEABLE PART AND TESTED FINE. (TC NR 20080214002)