4003 - Did I break my first Rickenbacker?

Pics coming soon but figured I'd write this out for now.
Bass in question is a 1988 Rickenbacker 4003.

Was doing a setup and tightening the truss rods in small increments and everything was going well.
Let the bass sit overnight and checked on it the next morning. Relief at 0.025" both sides (first/last fret pressed down, measured at 8th fret).
The bass played great even with that much relief but I thought maybe I can do better given I normally set up my basses between 0.01 and 0.015.

Did 1/8th of a turn on the treble side, so far so good.

When I was on the bass side, I noticed it was pretty tight already but I figured why not give it a shot.
As I turned gently to try and match the relief, something distracted me and I accidentally tightened by about 1/4 turn and suddenly something felt off.

I stopped immediately and assessed the damage. Two things I noticed:
1) There is a small crack in the fretboard under the D string (runs from the nut to about half way down the first fret). Could've been there before but I didn't notice it until now.
2) Looking into the truss rod hole where I was doing the adjustment, the truss rod on the bass side (E/A) looks like it has come out by about 1mm closer to the tuners than the truss rod on the treble side.

Not sure if that second point is clear but like I said, pics coming soon.

Surprisingly, the bass actually still plays fine and has maintained about 0.024" of relief even after a few hours.

My questions are: What problems can I anticipate from this as far as setups and making adjustments down the road and what's the best way to fix these two issues (I know the answer is likely take it to a tech but asking mainly to satisfy my curiosity in the short term)?
 
Here are a couple pictures. Black line by the D string is the crack.
 

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Your two questions are related. The wood fibers have been crushed, basically. The best way to fix it is by fixing the crack and reinforcing the area around the truss rod nut. Done properly you won't have any problems down the road.

The fretboard lacquer complicates the issue but a suction cup might be able to pump enough glue into the crack without requiring any major finishing work. The area around the nut will then be reinforced with CA glue and a metal shim.

It almost goes without saying but please don't do this yourself. It's not complicated but it's messy in ways that will quickly turn the repair from 'relatively straightforward' to 'nightmare'. The crack is fixable. The crack with super glue all over the fretboard and down the truss rod threads is fixable, but for a price that will be significantly harder to stomach.
 
Yes, the crack is fixable especiallly if it closes up when you release the truss rod tension. For reference you’re supposed to adjust that style of Rickenbacker truss rod by manually flexing the neck into position and adjusting the nut to hold it there. Any truss rod really isn’t designed to bend the neck wood but to hold it against string tension, those especially so.
 
I had a similar crack in an old beater P Bass my son was gifted, same process: loosen the trussrod, in my case had to clamp the neck a bit to close the crack. I see some CA and a tiny bit of rosewood dust, it’s nearly invisible, looks like a grain line. The lawyer does complicate matters in your case, but some kind of drop fill should work. Do it (or have it done) sooner than later so the crack doesn’t accumulate gunk. Surprised it happened at all.
 
Also check the side of the neck. If that's happened on the 'board, there's a possibility it's also occurred at the first two frets where the binding is . Happened on a old '73 4001 I had purchased.