So, I found a PS3 COK-002 on a dump today. TLDR, errlog was full of 0xa0404422 and 0xa0403034. Only these 2, nothing else.
When I tried bringup to see what happens, this is what I got:
[SSM] state: 0000 -> 0101
Bringup Mode #0 (0xFF)
[SSM] ssmCb_OnStartingBePowOn() called.
[SSM] Bringup mode ...