What was found
SOMETIMES FLAPS WOULD GO PAST THE DESIRED SETTING. PROBLEM WAS TRACED TO A STICKING FLAP CONTROL VALVE. ORDERED AND INSTALLED OVERHAULED FLAP CONTROL VALVE. WITH FLAP HANDLE 'UP', FLAPS EXTENDED. USED POWER SUPPLY TO CONTROL NEW VALVE. WHEN THE EXTEND COIL WAS POWERED, THE FLAPS RETRACTED. WHEN THE RETRACT COIL WAS POWERED, THE FLAPS EXTENDED. THE FLAPS MANUAL CONTROL WORKED NORMALLY. ORDERED AND INSTALLED ANOTHER FLAP CONTROL VALVE. THIS ONE WORKED NORMALLY.