A5200 has a bad Interface Board?

Sorry for the post about an old piece of kit.
I recently installed an A5200 with 22 FC drives and attached it to dual QLA2302 (I think) HBAs. All told everything works great, except port B0 on the A5200 will not show online.
The array is in split loop mode and the hope was to get 4Gb/s out of it through the four connections plus some redundancy.
The specs:
* Sun V40z
* OpenSolaris build 128a
* 2x QLA2302
* 4x 1Gb GBIC
* 22x 73GB ST373454FC
* 1x A5200
The A5200 shows B0 having zero nodes and the other three having 13 nodes.
I have tried the following and the problem stays with port B0:
* Swap fibre cables
* Swap GBICs
* Swap HBA ports
* Swap HBAs
* Reseat interface board
* Reseat GBIC
No matter what I do, port B0 will show a signal, but not online. Going into test -> debug -> 7 on the A5200, the "SOC HW Regs" screen, shows all working ports with an AL value of 0001, while port B0 cycles between 0080, 0800 and 0400.
The only thing I haven't swapped are the interface boards.
I have looked high and low in the documentation and cannot find the meaning of these "SOC HW Regs" values.
Do I have a bad interface board?
Any and all insight appreciated.
Sincerely,
Marty

I hate to reply to myself.
After reading the troubleshooting guide closer, I enabled auto-bypass and port B was disconnected from drive six on the front backplane.
A simple offline, remove, insert and online reset everything to it's regular state of happiness.
Now zpool is scrubbing a 22 disk RAIDZ3 stripe at 250 MB/s and I am much happier.
Hopefully this will help someone else save a little aggravation.

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