!. The PDK transmission is replacement part and Porsche does not provide any parts, nor tech support for this transmission. PDK is replaced for about 20000$ USD. No clutch pack replacement neither
2. You need special equipment and tools to just change the trans fluid.
http://forums.pelicanparts.com/porsche-996-997-991-forum/1065032-pdk-clutch-pack-replacement.html
https://rennlist.com/forums/997-forum/1172826-guide-to-repairing-a-pdk-transmission.html