Is it not particularly unusual to have irregularities showing on more than one engine?
and
Is it not particularly unusual to have indeterminate irregularities (even if minor) showing on all engines?
Just basic questions that I see from my perspective - no vitriol necessary.
You guys might fly every day with a number of issues over which a decision is made to continue and monitor. On the other hand I see press reports of flights returning to base because a warning light was showing that on examination only proved to be a faulty sensor.