Ed Sett;
The June 2005 BAes report, to which I refer lists the following;
(a) 15 ducts - engine to cross feed cocks
(b) 12 ducts - between cross feed cocks
(c) 7 ducts - downstream of 5-way duct pressure reducing valve.
Note: Many of the above had already been identified in an earlier "quick look" report, dated 7th Jan 2005.
Ducts listed under (a) and (b) are now being replaced in the duct replacement program, four yeras after they were dclared "life expired".
Hope that helps.
DV