As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING A GROUND RPM CHECK IT WAS NOTICED THAT WE WERE UNABLE TO MAKE STATIC RPM ON THE AIRCRAFT WITH MINIMUM REQUIREMENT BEING 2300 WE COULD ONLY MAKE 2250. AFTER TRYING SEVERAL THINGS WITH NO IMPROVEMENT IT WAS DECIDED TO PULL ONE CYLINDER TO INVESTIGATE. UPON REMOVAL IT WAS FOUND THAT THE CAM LOBES WERE WORN BEYOND LIMITS ON THE CAMSHAFT. THE ENGINE WAS THEN REMOVED AND SENT BACK TO THE OVERHAUL SHOP FOR REPAIR.