As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE WOULD NOT ACCELERATE ON START, ADJUSTING START DERICHMENT AND START ACCELERATION TO MAXIMUM HAD NO EFFECT. FOUND PRESSURIZING VALVE TO BE STICKING. REMOVED VALVE AND POLISHED. VALVE WOULD STILL HANG UP. REPLACED VALVE AND UNIT TESTED SATISFACTORY.