Mike:
That's the same model that I have, and unfortunately, the same problem. Not sure if your cause is the same, but I'm betting so. Check the trim at the bottom of the filon on the top half. The factory used trim that just barely, I mean just barely, covered the filon. Over time, the sealant dried up and let water intrude and get wicked up into the wood. The fix is not pretty but it is better than when it left the factory. I had a local shop do it and they did a good job, but it meant replacing water damaged wood in the wall, replacing the bottom rail, plus better trim along the bottom. Also, the shop put some pieces of metal between the wood rail and the cable to prevent the cable from digging into the wood.
The cable adjustments are on the driver's side, about where the hydraulic cylinder is located. There are instructions for adjusting the cables to "level" the top elsewhere on this forum.
Good luck!