OK, so I was able to loosen both sides and there was a small amount of slop on the bolt holes. I rotated them opposite of each other to try and bring the mast indexes more in line with each other.
Before I made the adjustments the bucket had about two and a half inch difference in height from the left side to the right side. Measuring the top of the masts, the left one was more than an inch further forward than the right one. After adjusting them the bucket is still more than an inch out of level and the masts are about three quarters of an inch out of alignment. So, there was some improvement but not a total fix.
I have noticed while trying to fix this problem that the bigger problem than the bucket being level is the right mast moves on the post no matter what I do. The left post doesn't move. Because of this, the left mast takes far more of the load than it should, the right mast moves on the post before it "engages the load"
I've thought of several different ways that I could fix this and I'm not sure which would be best. Drilling out the holes on one of the posts so that I could rotate it more is one option or buy a new post for $150. I also talked with my dealer and explained the situation. He agrees that the index on the post is defective but neither of us know which one is bad. I would need to compare them to a new one to see which is defective.
The dealer is going to talk to John Deere to see if they can suggest a fix. I am well past the one year warranty on the loader but he agrees that the problem has been there since it was new. He's out of town all next week so I won't here any thing from him for at least a week or so.
I'm not very confident that Deere is going to do anything. Even though the tractor only has 165 hours, I bought it over three years ago. So the question is should I just try and fix it on my own or wait to see what they say?
I guess it would be nice to know if any one else has had this issue and what was done to solve it.