shawnster,

I'm not exactly sure what they are called but I think they are plugs. My 240D had them loosen up and they leaked alot of oil.

I was able to get a wrench on mine and tighten them up. I'm surprised your guys couldn't figure out a way to get on it.

I think I tightened up the ones on my 300D when I had the vacuum pump off (to replace that gasket).

Good luck

240Joe