A burnt Squid Axon
https://cdn.masto.host/mastodonflockofnazgulscom/media_attachments/files/112/509/001/760/023/220/original/024cfc620c9ffa8a.jpg
Here's the rear face. The burnt part is in the upper left quadrant, unsurprisingly near the 10-pin cable connector. Although I'm usually assiduous about aligning the red stripe on the cable properly, it looks like that time I got it wrong, hence the damage.
Unlike some of my other modules, prying this one apart appears to be non-trivial, so I don't have a pic of the back of this PCB
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