(17 Jan 2017, 9:08 pm)mb134 wrote I'd argue that there isn't a great deal of difference between the E400 and E400 MMC cosmetically, at least the average passenger will barely notice. Let's not forget that the batches currently on there are hardly identical either.
What would you propose as a suitable spare?
Yes I quite agree. So long as they're all Sapphires the passengers wouldn't give a toss.