Yes, the trip is ex-CMB but started as Cathay paper. It's not unlikely that *leaving* a place on a e-ticket is the real problem.

AA turned turned paper into bits on a computer during a re-issue, and I played along because the poor Aagent at ONT was nearing tears after struggling for two hours to get it to that point, and was going to morph into a gate agent soon. (And all I was doing was adding two NA segments into a well-documented, machine-printed five-segment trip.) But she also said "next time will be easy". We'll see - I've got 13 segments still unaccounted for.

I believe I've read here that e-tickets are firmly limited to 16 segments, btw. And another thread discussed a traveler's problems when he tried to reissue a ticket with 16 or so segments flown, only four to go, but the "system" insisted on doing something with all 20 segments and spit up all over him. An expert FT'er explained the special airline code the agent should have used to "roll up" all flown segments into one, and I think I emailed it to myself for future use...