Equalize them and cycle them a couple of times - see if that brings them back. Someone with some more 'cell knowlege' might be able to offer some better advice or even help you with it.
I had the same thing at the last n.west regional - I did one lap before it began to dump on a fully charged pack.
I have some almost new 4200 cells also which both packs had one cell that had discharged before the rest - a quick equalize on priceys novak tray has brought them back to life though.
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