V6 320 CDI 642 Rocker Cover oil leak

[lesmon]

As subject - Merc. CLS 219 V6 320 CDI 642 (diesel) engine Rocker Cover oil leak - this is leaking from the 2 'dowels' just under the oil cap (driver side).
I have been searching for an exploded view of the cylinder heads, or instructions to remove the rocker covers - but to no avail.

Any help would be appreciated - esp. the best sequence to remove items, gotchas and showstoppers, etc.

Thanks.

 

[Alps]

post some pics, prob leaking from the breather on the cover, they often go and need resealing with a gasket maker