As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 2175 DURING NR 1 AUTOFEATHER TEST, THE UPTRIM AND ALTERNATE FEATHER LIGHTS ILLUMINATED, BUT THE NP RPM DOES NOT DECREASE TOWARDS FEATHER. REMOVED AND REPLACED 6121-K1 RELAY. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.