AdBlue Check: 1050 km Range

Hello, now that the warranty has expired, the problems are starting to appear.

Passat Blue TDI, manufactured in 2009.

I drove to work in the morning, and then I received a message saying "Check AdBlue, 1050km remaining."
The next day, she was gone again, and then she reappeared on the 3rd.

I refilled the AdBlue in the summer.

According to what I've read in forums, the pump needs to be replaced.
"Even the NOx sensor and control units were replaced as a precaution, etc."

Has anyone had any experience with this? Or is it still possible to repair or inspect something?

Is Bosch service competent enough, or is "Freundliche" (a presumably local competitor) a better option?

I inquired directly with the VW dealer, but they need to consult with their technical department because they haven't encountered any AdBlue issues before.

Regards,
Chris.

Address 01: Engine (CBA)
Label file: RKS\03L-906-022-CBA.clb
Part number SW: 03L 906 022 EN, HW: 03L 907 309 A.
Part: R4 2.0L EDC G000SG 4518
Revision: 21H21--- Serial Number:
Encoding: 0000072

"One error found:"
008424 - Reducing agent.
P20E8 - 000 - Low pressure.
Environmental conditions:
Error status: 01100000
Error priority: 2
Error frequency: 2.
Mileage: 81791 km
Time: 0.
Date: 2112.14.28
Time: 06:39:37

Environmental conditions:
Speed: 1219 RPM
Last: 78.4%
Voltage: 14.06 V
Temperature: 2.7°C
3.4 bar
Temperature: 3.6°C
Last: 70.6%