As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT WAS UNABLE TO OBTAIN FULL RICH FUEL MIXTURE ON LEFT ENGINE. UPON INSPECTION BY MAINTENANCE, THE MIXTURE CONTROLLER LINKAGE WAS FOUND OBSTRUCTED FROM REACHING FULL TRAVEL BY THE DRY AIR PUMP PRESSURE AIR LINE. THE PRESSURE AIR LINE WAS CORRECTLY ROUTED SO THAT THE MIXTURE CONTROL HAD COMPLETE FREEDOM OF MOVEMENT. (X)