S70 Door Check Pillar Brkt

Do you mean the pillar end of the door check-strap?

If so, the bracket is held onto a weld-nut in the pillar by a Torx-40 screw - which you may be able to tighten with the correct torx bit and a square-drive T-bar or ratchet wrench (needs quite a lot of torque). Just pull back the rubber boot to get at the screw head.

If the weld nut has come away, or if the pillar is cracked, it's a welding job, I'm afraid.

Recently had the same problem the check stop weld was broken and had to have a bodyshop welding job done at a cost of £100 (US$185)