MZ-JPU512T not detecting, wondering where to start

Noticed a thread very similar to the one I'm making posted a few years ago, but it didn't get anywhere.

512GB SSD, looks in prime shape, no corrosion/visible damage of any kind. Refuses to be detected in two good machines that detect other SSDs. I can recognize some data-lines here, but unsure how to interpret them. I'm assuming a schematic for the SSD itself doesn't exist, so looking to see if there are any obvious places to start checking boardside on J3700 with the SSD plugged in. 820-3662 board.

edit - if not clear, fully aware this is an SSD-side issue. Wondering if there's any luck with repairing the SSD itself.
 
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