Trim - B-Pillar - Upper - LH - Remove and Replace: Remove

Open both LH doors.
Move the LH front seat fully forward.
Insert the seat belt release key (1133787-00-A) into the bottom of the seatbelt pretensioner coupling to release the seatbelt from the pretensioner.

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Move the seatbelt shoulder adjustment to the fully down position.
While wearing suitable gloves, spread the bottom of the LH upper B-pillar trim open, and then release the clips that attach the bottom of the trim to the LH lower B-pillar trim.
CAUTION: Be careful not to pull the LH upper B-pillar trim too far, otherwise it might break the seatbelt shoulder adjustment mechanism.

NOTE: Move the body seals to aid removal.

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Slip your fingers beneath the seal at the top part of the upper B-pillar trim, and then separate the upper B-pillar trim from the body.
Guide the seatbelt retainer through the LH upper B-pillar trim, and then remove the trim from the vehicle.
NOTE: Remove any remaining LH upper B-pillar trim clips from the LH B-pillar, and if the LH upper B-pillar trim is to be later installed, remove all clips from the trim.

Courtesy of TESLA, INC.