What was found
AUTOFEATHER WOULD NOT ARM ON TAKEOFF ROLL. SELECT LIGHT WAS ILLUMINATED. ABORTED T/O AT APPROX 50 KNOTS. INTEROGATED CDS AND FOUND FAULT CODE 70A ON NR 1 PROPELLER, FOUND AUTOFEATHER SWITCH STICKING AND NOT LATCHING PROPERLY. REMOVED FUEL/ ENGINE/ PROPELLER CONTROL PANEL IAW AMM TASK 31-10-01-000-801. REPLACED AUTOFEATHER SWITCH WITH NEW FROM STOCK IAW AMM TASK 31-10-01-000-802 STEPS 1-3 AND 4E. AND 31-10-01-400-802 STEPS 1-3 AND 4E AND STEP 5. REINSTALLED FUEL/ ENGINE/ PROPELLER CONTROL PANEL IAW AMM TASK 31-10-01-400-801. OPS CHECK GOOD. RETURNED TO SERVICE.