As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE WOULD NOT GET ABOVE 1,500 RPM BEFORE TAKEOFF. TRIP CANCELLED. PERFORMED GROUND RUN ON LEFT AND RIGHT ENGINES. BOTH ENGINES PERFORMED SATISFACTORILY. FUEL MIXTURE SETTINGS MIGHT HAVE RICH CAUSING RPM LIMITATION. AIRCRAFT S/N, 6006087961195. (X)