Try having someone press down on random parts in the rear. Our rear over head light on the passenger side squeaks/rattles. Have just learned to deal with it for now.
I have a sport and focus almost the same 2.0. With the ST I had heat soak like crazy in the summer with the BS I don’t/haven’t noticed it. I have upgraded the inter cooler on the ST which is a night and day difference. Maybe reach out to some of those folks Depo, CP-e, misimoto.
Mine does the same thing. It unlocks it opens barely. Does not release it to the open position.
On the other hand mine thinks it’s not closed properly sometimes. I have to close hatch and window individually for DRL to turn off.
Try again or go to a different dealer. I had mine fixed using the same TSB number. They had trouble finding it at first but I was very firm. Took 3 weeks for the part to get in freight train sound is now gone. Took them 5 hours to replace.