As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT NR 3765 HAD TO RETURN TO GATE DUE TO HAVING THE NR 1 PROP FEATHER WHEN THE AUTOFEATHER SELECT SWITCH WAS SELECTED TO TEST. MAINTENANCE FOUND THE NR 2 ENGINE INTERFACE HARNESS SHOWING A STRAY GROUND TO THE TORQUE SIGNAL CONDITIONING UNIT. HARNESS WAS REPLACED. AIRCRAFT WAS GROUND RUN, ALL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.