Wow. That's the exact problem I'm having. Do you have any pictures of the problem switch?The diagnosis sheets helped me figure out that my trunk switch S69/12 was the problem with my car - after testing though I found that the switch was good, but the locking / unlocking mechanism was sticking - had to take apart the key side and remove the plastic cylinder that is operated by a spring around it (a plastic bar couples it to the trunk latch) - after sanding / filing a bit off and several trials fits, I finally got it operating freely and it now allows contact of the switch in the latch.
Was having issues making the trunk close before - obviously these were related.
Thought it was worth sharing this as it took a couple hours to diagnose and correct.