Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
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On some models with the instrument cluster or other electronics removed from the vehicle this may cause electrical issues with other components from operating properly.If this occurred after the cluster was removed there is a chance this is the cause here possibly.
You may also have a weak hydraulic pump for the top system.It is making noise as it is operational but may not be making fluid pressure to operate the components.I have seen some pumps fail needing replaced.This would have to be tested further to be sure this is the cause here.
Unfortunately I do not see a procedure myself on how the roll bar can be activated manually.This doesn't mean there isn't a procedure just that I don't see one myself.