I'm assuming that other AP's can move between the two WLC's fine? Is that the case or not? Do you have AP Groups defined that might be wrong? Want to see what you have done as far as testing before you should try to factory reset that mesh AP. That would mean you have to go to that AP unless its on the 'Good' WLC and factory default it. I had one not too long ago that did that on both WLC's and a few factory defaults fixed the issue. I also downloaded the code back to the MESH from the WLC.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
This is the start of a display filter cross reference between Wireshark
and OmniPeek. The 1st installment is a table of advanced filters. More
filters will be added as time allows. It is a living doc, so check back
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