Alternator: Car Alternator Replacement & Repair

Hello forum.

My alternator is making noises. It made a very loud cracking and grinding sound, about three times, which I heard immediately after starting the engine.
While idling, I put my ear to the LMA, and it made a terrible cracking sound (once) that startled me.
Now, immediately after starting, there's a slight squeaking sound, especially when idling.
I've noticed that for a long time.

I suspect the LMA bearings are faulty.
No issues with power supply.

My question to you.
Has anyone replaced the EGR valves themselves?
Is it a lot of work?
What should one consider?

I would be grateful for some good tips.

Could it be that the tension spring/coil spring is too strong?
(Only 40,000 kilometers have been driven.)
Can the tensile strength be tested?

I've had to replace a lot of parts on my car.
It hasn't been fun for a long time.
- January 2002 / Water pump, 130,000 km / Bearing failure.
- February /Power steering pump /Bearing replacement.
- Now, LMA / Storage area? at 146,000 km.

Furthermore:
-2 * Engine Control Unit + Injector with NBF.
- Cylinder head
- 2 x R 109 /from more recent production/

Brand new one month ago: Timing belt + tensioner roller - €250. VAG.

VW Golf 3 Variant, 1.4L engine, manufactured in June 1996, 146,000 km.

Best regards to everyone.

Goodbye and hello.
Jarek.