Mercedes SL 500 R 230 tailgate opens heavy

Hello, I’m still relatively new in the SL scene and I have a question. My tailgate opens relatively heavy-handedly. In practice this is how it works: I press the button on the key, the tailgate jumps up slightly. Then I want to open it and notice that it is relatively difficult. With a normal boot cover I would say that the gas dampers are a bit weak on the chest – with the SL this can hardly be a topic. What I still notice is a slight squeaking. Is there perhaps a point that I could lubricate (and with what) to make it a bit more smooth again? When closing it, I also have to throw the lid relatively sweepingly “” – I don’t know whether this is normal? When opening the cover I notice my limitations. Of course, I hear the pump surren… but that should be normal – but I don’t have the reference, as it may be. Many thanks already in advance for your assessments.