This Danish Govt site is the only free access I know about for the ICAO Docs. Better for you to search them than me, since you know what you are looking for.
http://dcaa.slv.dk:8000/icaodocs/
edited to disable the smily that was screwing up the url
After having a look around in the other docs, go to:
http://dcaa.slv.dk:8000/icaodocs/Ann...208th%20ed.pdf
Chapter 4.7. This gives further refs to more detail on ETOPS