I'm bored today, so I hope you don't mind me replying to an older thread.
If you're able to do your own work you can do this your self! Depending on your certificates it'd just be between you, your plane and the FAA!
This problem can often be detected on your pre-flight by putting flaps down, then pushing upwards on the trailing edge. If you are able to move them up, as the wind would try to do in flight, be ready for the flap to try to raise then almost instantly go back down when that upward pressure is released.
You can actually get a glimpse of the cam setup that controls the system by pulling down the aft portion of the liner, where the hook and loop fastener is. May need a flashlight but I don't think you can make the adjustment with just that portion pulled down. Either way, it's on the right side of the plane where the flap control rod penetrates the fuselage.
It'll be a bit of a job, as you need to remove the head liner. Depending on the interior you have this can be a pain or a huge pain, but doesn't take any special tools.
A #1 & #2 Phillip's screwdriver and a 2.5mm hex key for the center light panel on the headliner. The emergency light is kind of delicate so be careful when you remove it and it's hanging down. There's a hidden screw behind that light, one inside the sunglass stow and a last screw in plain sight on the aft end of that panel.
I don't think you need to remove the seat belt covers but I think removing the liner is easier with the mounting point on the wall taken down. The trim bits just pull straight off and I think that bolt is 9/16". Pay attention to the orientation of the bushing and washer in there.
The sun shades come out easily when you remove the adjustment knobs. After that, the only thing holding the liner on is heavy duty hook and loop fasteners at the aft end of it (and possibly in the center section) and a little metal trim piece at the base of the liner.
Pull down in the center with one hand, where there will be a couple large cutouts, and sort of slap upwards on the outboard sides with your other hand. The aim is to dislodge one side at a time; and be careful at the forward areas where the trim and the head liner have a decorative curve as it's easy to get the liner caught there. Once one side is done, the other side is really easy. A flat head screw driver will help you remove the clamps that go to the two rear vents. Just don't snag any of those wires when you're getting the liner out of the front doors.
All of that can be done with seats in or out but I find it easiest sitting in the rear seats. A second set of hands helps but isn't needed.
Once that's out, the adjustment is on the right inboard side, above where a passenger's right shoulder would be...ish. You'll see the micro switches, some rollers and a cam of sorts. The cam is where you make the adjustment and it can be loosened a little by way of a worm clamp. After staring at it for a while, you should be able to figure out which direction to adjust the cam so that the roller is in one of the detents when the flap is at the correct selected position.
Close up is simply reversing the whole thing.
While you're in there, feel free to inspect your aileron cable pulleys.
Oh, I almost forgot! If you follow the flap control rod outboard, you'll see where a bolt goes through to connect everything together. One bolt on each side. Take a look at your headliner adjacent to where those bolts are for any wear marks! If you DO find wear on your liner, think about if re-orienting that bolt would cure that! The wear won't cause any problem other than a hole in your very expensive head liner but...you don't want that for yourself on your beautiful new plane!
This is all from memory, but I think that pretty much covers it.
Send pictures!
