Tom,
All RAAF ORBs are available online for free.
Go to
http://naa12.naa.gov.au/SearchNRetri...sicSearch.aspx
Type as keyword (for example) 86 Squadron history, and then read the digitized items.
Or you can also type as keywords combat reports, there are digitized files for some squadrons (including 86), but not all of them, contrary to the war history sheet (actually ORB Form 540/541) that are almost 100% available (from memory one or two rear aera squadrons are not digitized)
Best regards