What was found
AUTOFEATHER ARM LIGHT REMAINED ON AFTER SELECTING SWITCH OFF. LIGHT EXTINGUISHED AFTER ACFT LEVELED OFF AND POWER LEVER RETARDED TO APPROX 40 PERCENT TORQUE DURING DESCENT AUTOFEATHER LIGHT RE-LLUMINATED AND EXTINGUISHED BEFORE TOUCH DOWN. R & R TSCU AND CLEANED CONNECTOR PLUGS ON NR 2 TSCU. GROUND RAN ACFT. OPS CHECKED GOOD. CHECKED AUTOFEATHER TEST 12 TIMES IAW MX. RUN MANUAL. AUTOFEATHER ARMS AT 40 DEGRESS AND 54 PERCENT TORQUE. ARM LIGHT EXTINGUISHES EVERY TIME BELOW 54 PERCENT TORQUE.