1985 300D turbo - oil dripping from turbo

I am slowly working my way around the engine cleaning and searching for oil leaks. Around the turbo I have 2 leaks. One in back, (from misaligned breather drain tube) and one in front. Looking from under the car up, the boost pressure control valve (correct name?) looks like it has oil dripping from it. Not knowing how turbos work, is this a place for oil escape? I do have a little oil in the breather elbow. Also wondering what is inside the "trap" inside the middle of the air filter housing. Looks like 2 plastic latches could be moved and the trap opened. Is this a place to clean/inspect? Thanks for the help. Also the chapter "why does my diesel leak", is a great read in the new Diesel Engine Advanced Diagnotics. I am rereading it daily.

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