When we had a fuel door problem with one of our 850s, I learned two things.
To remove panels to reach the mechanism, I had to start in the middle of the top of the hatch opening. I also had to remove more panels than I first thought.
Secondly, the problem was caused by the grommet around the locking pin, it was not fully installed and was curled up on one side.
I found the same problem on one of our other 850s, but I could correct it by poking it a bit with a dental tool to uncurl the grommet.
When you get things apart, check for this problem.
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