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The one in the front looks like a fetzer valve and the one in the rear is where the bypass line would go if you had one. It's all ball bearings nowadays.
The one in front looks like a fill plug, which does not make sense given where it is and the fact that the service manual does not reference it in relation to gear oil or anything else. Can't help with the actual purpose though.
The one in front looks like a fill plug, which does not make sense given where it is and the fact that the service manual does not reference it in relation to gear oil or anything else. Can't help with the actual purpose though.
I've searched but can't find any PDK technical or service info on the interweb, not surprised by that either. The only good info is in the 991 SIT Porsche document, but it doesn't cover any maintenance info or exterior fittings info.