I don't know where the line is on the roadster but look under the carpet next to the door (or maybe ask a mechanic in the dealer (10 euro to him) he could tell you where the vac line going back to the trunk (boot) is.. if u find that line cut it (u can put fitting in later for repair) you can get a little air compressor like the one in the trunk i don't remember which it goes pressure opens or vac opens the trunk this way you destroy nothing. if u have a manual look it up or maybe someone state side could find it hope this helps jim