I replaced the rocker cover gasket and thought I would share what I did as there doesn't seem to be much info on this.
I have a TDI150 and the parts I got were from GSF Reinz gasket sealant grey 982VG0011 and Reinz Rocker cover gasket 110VG0200 £12.49 for the pair.
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I removed the 90 degree pipe the goes into the EGR on the left side of the engine and also removed the cambelt cover. I then removed the bolt (5) on the charge pipe and the circlip attaching the pipe to the air filter and pushed the charge pipe back a little. I then pushed in either side of the clip (4) and this releases the pipe.
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It may be possible to get to the number 10 bolt with a long thin extension bar and a universal joint attachment, but I only had a 3/8 extension bar and had to undo the 3 EGR bolts (6mm allen key) so I could move it enough to get the extension bar on the number 10 bolt.
The diagram shows the order to undo the bolts (and also do them back up in this order). Once the bolts were all loose I got the rocker cover off (It would come off easier if you pull all the bolts out, but then you risk dropping them)
The bolts have an in-built washer that holds the gasket in place so when you pull the rubber gasket off, the bolts will all drop out. I put the new gasket onto the rocker cover, replaced all the bolts and checked the gasket was flush with the rocker cover. I then cleaned the surface of the engine and added a thin line of gasket sealant all the way around the engine, before replacing the rocker cover gasket.
I went round all the bolts screwing them in a few turns to check they were all seated and the rocker cover was seated correctly. Then I went round in sequence tightening the bolts to finger tight, then did this again as the first couple of bolts were loose. Then I went round in sequence nipping the bolts with the socket wrench using the end of one finger and thumb and then went round again using the end of my finger tips so I didn't over tighten. I was aiming for 10 - 12 pounds of pressure and didn't have a low pressure torque wrench.
I put everything else back together left the car for 3 hours for the gasket seal cure.