I don't have a screenshot (I should put Flash-it on my 637CD, I'll probably do that and use my home server to get them to my modern PC), but it doesn't show the proper upper ASCII characters when I connect to the Captains Quarters II BBS
That immediately tells me that your hard drive probably went
and this tells me the hard drive is probably trashing the bus. Happened in my 2000 Ruby iMac DV, fixed it by removing the dead drive and replacing it with some other hard drive
try checking continuity between the SWIM and the floppy connector. I know SE/30 schematics exist somewhere, so that should help you should any traces not have continuity
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