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I have a very similar issue with my Macintosh Classic. It is a replica board though…

Do these have their original ROMs?

And it‘s clear this is a n/c pad since there is no trace to it. Btw you seldom repair such a board by replacing chips. Broken fuses, traces, solder joints or leaking capacitors are much more common. Let‘s hope you didn‘t do more damage to it.

On PLCC chips, you count from the dot.

This pad (pin 5) is deliberately not connected, so there should be no difference. The part at L1 is an inductor (coiled wire) and most certainly not in need of replacment.

mF should mean millifarads. However, I agree 1uF is much more realistic for what you describe.

siliconinsider usually does a great job. I have 4x4MB SIMMs from him in my SE/30 which work great! The SE/30 however is very picky about RAM. Did you install them correctly? What are the symptoms?

I used a little bit of WD-40 and bent the chassis slightly outwards.

My Classic looked the same. It‘s working again, now :)

Did you put any image files on the SD card?

I didn‘t hear that either, but I have heard that the SE / SE/30 have shockingly thin wires, causing significant voltage drop.

Well, if I believe the rumours, the 128k must have the thicker wires 🙈

The repo https://gitlab.com/DavidGriffith/minipro claims experimental T48 support

I‘m not quite sure if this is a helpful answer, but I use my TL866II+ with modern macOS using minipro. Maybe the T48 is also supported..

There is no point, except for aesthetics. Just put your screen into stand-by mode or switch it off.

Is this the same as the well-known Supermario source code?

Are you sure your image files on the SD card are not fragmented?

I‘d just go for a decent USB scope.. Or a Saleae logic analyzer, which also has analog inputs.

You can probably read the IP address from ARP packets (or even send your own requests to the Mac)

Instead of a BlueSCSI, it might be simpler/cheaper to use a generic IDE to SD adapter.