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Amazingly, James from Seven Sigma Systems got back to me and actually has components to build these still! Also directed me to a website with pictures of the device: https://sigmasevensystemsltd.weeblysite.com/product/powerbook-serial-adapter/1

Ah, given the URL being on ancient hosting and many dead links, I didn't realize that they were still around - I'll email and report back.

Does anyone have one of the "PB Serial Adapter" that goes in the modem slot of 1xx series Powerbooks as described here: http://ruby.he.net/~sigma/pbsa.html I'd imagine that it has some minimal amount of logic onboard (maybe voltage shifting?) but other than that would be pretty easy to clone...

All of the pins on the capacitors are tied to the power pins - I would unplug the PSU and use a multimeter to tone them out (continuity check) from the power supply pins from the side with the wider line on it (which is positive in almost all cases) to the corresponding pin, and from the other...

I had a similar problem with C35 on a system I was recapping, where removing it pulled off both pads and the power vias. Only happened on this cap, none of the others. I looked up datasheets for the nearby serial transceiver chip, and attached the replacement cap to that instead with magnet...