Could anyone advise on the next step?
I wish there was a step by step process to testing, I'm finding the bitmain maintenance guide too muddled. All of the information is probably in front of me but I'm struggling at the moment.
My first post should be the right link you need to follow if you suspect the hashboard had hardware issues if you have a good PSU and known hashboard data cable(ribbon) better check them first before you suspect the hashboard had a hardware issue.
Get some idea on how they troubleshoot the 0 ASIC below
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https://www.zeusbtc.com/articles/asic-miner-troubleshooting/3126-antminer-s9j-chain-J7-has-0-asic-S9j-kernel-log