As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON TAKE OFF THE PILOT REPORT THAT LT PROPELLER WOULD ONLY MAKE 85 PERCENT NP. CHOSE TO LAND THE AIRCRAFT SGF FOR FUTHER INVESTIGATION FOUND GAUGES WERE READING CORRECTLY AND ON THE GROUND RUN UP STILL ONLY PRODUCED 85 PERCENT. THE LAST LEG OF THE TRIP WAS CANCELLED, IT WAS A REPOSITIONING FLIGHT. THE CAUSE IS STILL UNKNOWN AT THIS TIME.