td, thank you very much for the clarification.
You imply that a cracked AGB is ‘not good’ on a new engine, but is this ‘not good’ of any greater significance than any component failure on an ETOPS engine?
Is AGB – Auxiliary Gear Box as in
Air France Industries KLM Engineering & Maintenance - GE90 On-Wing AGB Replacement ?
If the other rollbacks, unrelated to this thread (and to any software error) did not involve ICI, but possibly a sensor, then perhaps the concerns about the potential simultaneous reduction of power are valid and relevant in all flight conditions, not just ETOPS.
I’m not ‘fishing’ here, thus a philosophical closure to this aspect might be sufficient. However, I suspect that many operators would be uneasy with the recent occurrences of apparently related rollbacks, in a highly reliable engine, without explanation.