Well. Got my FP2 back from service today.
Good thing: The camera works now pretty good:
But.
This is how i got my FP2 back:
Cover was not put on properly, I guess with brute force - which caused the broken frame of the display module. (Over the left blue bracket, you can also see some traces on the display itself)
So all in all: I had to send in my whole, functioning FP2 instead of only my camera module because of “we would like to diagnose…”. Had no phone for over a week, got it back damaged …
If you assume some frustration here, you might not be wrong.