XC60 FWD L6-3.2L VIN 96 B6324S2 (2010)
Check for loose clips by gently pulling down.
If clip 1 is not secure push the rail outwards to align over body stud.
If clip 2 is not secure slide clip (not cover) backwards to align over body stud.( see pic.above)
If clip 3 is not secure push the rail outwards to align over the body stud.
Repositioning clip 2.
NOTE:
Bold arrows show direction of alignment.
Final Inspection: be sure the cover is attached at all locations and firmly held in place.