As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURNBACK GEG FLIGHT 8903: SHORTLY AFTER TAKEOFF AND BELOW 900FT AGL TAKEOFF POWER SLOWLY DECREASED. EMERGENCY POWER LEVER WAS USED TO RETURN SAFELY TO GEG. NO EMERGENCY WAS DECLARED. UNABLE TO DUPLICATE THE PROBLEM ON THE GROUND. AS A PRECAUTION ENGINE FUEL CONTROL UNIT (P/N 3244897-3, S/N B10190 TSO 6919) AND PROPELLER GOVERNOR (P/N 8210-002AG, S/N 1480103 TSO 151) WAS REPLACED WITH OVERHAULED COMPONENTS.