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A positive locking device must be installed on the zipper in the baggage compartment bottom to prevent articles to fall through and foul the controls.
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Install a new fuselage gas tank overflow line and replace the imperial brass compression sleeve with a rubber washer.
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To provide additional bearing area and more positive locking action for the aileron control stop adjustment screw.
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Inspection of the flexible hose in the engine breather line for contraction and possible clogging.
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Inspection and rework to detect the use of improper screws attaching the left and right rudder pedal shaft assemblies to the nose wheel steering tie rods.
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How to preclude failure of the exhaust stacks which can cause carbon monoxide contamination of the cabin when cabin heat is used.
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Remove the fairing at the wing root of each wing and inspect the wing root area for interference between the forward fuel line and the aileron cable and/or aileron pulley.
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Due to recurring failures of the control cables, all cables should be carefully inspected at each section which passes either over a pulley or through a fairlead.
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Determine if the attachment of the rudder control arm to the torque tube has been reinforced by a steel strap.
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Replace the adjustment screw in the lower end of the control stick horn, with an AN 520-10-44 screw in order to prevent interference with the lower fuselage skin.