As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - ON FLIGHT NR 2207, RETURNED TO GATE, DURING AUTOFEATHER TEST. THE NR 1 ENGINE FEATHERED NORMALLY, BUT WHEN LIFTING THE TEST SWITCHES TO CHECK NR 2, THE NR 1 ENGINE FEATHERED. MAINTENANCE REPLACED AUTOFEATHER CONTROLLER. AUTOFEATHER SYSTEM AND POWER UPTRIM OPERATIONAL TEST GOOD. AIRCRAFT RETURNED TO SERVICE.