I'm assuming this is it - https://bitmain.zendesk.com/hc/en-us/articles/204875015-How-to-diagnose-S5-hashing-PCB

Unless they were referring the the blade one - https://bitmain.zendesk.com/hc/en-us/articles/203559969-My-S5-hashes-at-about-600GH-S

We will see I'm right.  I'm sure they come back and put right one once they notice it's not there in post.