What was found
DURING TAKE OFF, 80 KNOTS, AUTOFEATHER ARMED, THE LEFT AUTOFEATHER LIGHT ON THE PFD EXTINGUISHED. DECISION WAS MADE TO ABORT THE TAKE OFF. MAINTENANCE REPLACED BOTH AUTFEATHER SWITCHES ON THE LEFT POWER LEVER. GROUND OPERATION CHECK WAS GOOD. A SUCCESSFUL OPERATIONAL CHECK FLIGHT WAS PERFORMED. AIRCRAFT WAS RETURNED TO SERVICE.