As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON TAKEOFF, PIC REPORTED THAT THE LT PROPELLER WOULD ONLY MAKE 85 PERCENT NP. HE CHOSE TO ABORTED THE LAST LEG FROM LNC TO CRG AND CHOSE TO LAND SGF WHERE AFTER A GROUND RUN UP DETERMINED THAT THE LT NP WAS READING CORRECTLY. THIS LEG WAS A REPOSITIONING LEG AND NO REVENUE PASSENGERS ON BOARD. THE CAUSE FOR THIS DISCREPANCY IS YET UNKNOWN.