So here's an update. As expected, it finally checked in shortly after I left for the day. We tried something seen elsewhere, un-claiming, resetting, re-claiming then adding the MX to the desired network. It came online within a few minutes. While I understand and agree with the replies regarding the need to upgrade code, these MXes haven't been offline that long (no more than a week or so) so they shouldn't be badly out of date and it doesn't explain the trickle of data I see on a link that otherwise runs at expected speeds. I'm not convinced that there isn't something else going on.
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