I have an 87 E34 that I bought two years ago. I had all the hoses replaced, the hose for the sea water cooling to the engine heat exchanger ran from under the galley sink to the engine under the floor boards. In order to replace that hose, the yard lifted the floor board between the galley and the engine. As far as I know, it was just screwed down, not glued. The yard said it came up easily and went back down OK.