Working on my boat today, I noticed that pulling the rudder downhaul line did not bring the rudder all the way down. You can't pull any further on the handle, but you can walk back and push the rudder another 10 degrees or so down to straight vertical.
My first thought was well this had been this way from the dealer out, and I never noticed it. So I got busy and found a way to take up some slack where the downhaul line attaches to the rudder. Tweezers and tiny knots... Gained about an inch, and thought that should do it. But there was no change whatsoever.
So I got the mirror and started looking inside. From the front hatch, you can't see any part of the downhaul assembly because of the big piece of foam mounted there. From the back though....
NOTE--both these pictures are showing up here upside down; that is, the upper deck is on the bottom of the picture. Don't know why, since the originals are not that way.

This is what I saw from the back. Some part of the downhaul line assembly is looped around the internal protrusion of the fishing rod holder hole. Maybe that's not supposed to be that way.

Here's what it looks like after I reached in and slipped the black line off of the protrusion. Once that's done, the rudder goes all the way down again. Loop it back, and the problem returns.
I think this is one of three things that happened when I was bashing about in a chop: (1) the mainsheet hook was thrown out of the clew grommet on the mainsail; (2) the tubes for the steering lines jumped out of the holder up on the inside of the deck and were loose across the rear hatch opening; (3) and I guess somehow the rudder hold down line looped itself around the rod holder protrusion.
Anyway, I guess I'm going to be looking for things like this now after a bumpy ride. And taping the mainsheet hook going out in wind and chop.