The cylinder will have to be replaced. I can't tell which one it is although it looks to be the major roof lifting strut.

If that is the strut it is part# 129 800 02 72. With the trim off the outside of the top well there is access to the bolt.piivot pin at the bottom.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician