Annex writes:
Those bolted joines that are subject to boroscopic evaluation have to be those connections between the Modules 2, 3 and 4 - s.a. RR-brochure > gasturbines_tcm92-4977.pdf - sorry I have no working link. One of these bolts is visible in that Trent 900 cutaway I posted a while ago just on top of the Nr. 2 ball bearing.
Try this:
www.rolls-royce.com/Images/gasturbines_tcm92-4977.pdf
Cheers!