ABS Control Module: No Communication Passat 3B5

Hello everyone, I'm experiencing a common problem with my Passat 3B5, manufactured in 1999. The error message is: "ABS - No communication between the control panel and the ABS." My question is, I know there are companies that repair the faulty solder joints. Has anyone here done this themselves? I would appreciate any information, perhaps even instructions on which specific areas need to be repaired. Thanks in advance.
Best regards,
Jürgen

You can't solder that.
These are bondings, or whatever they're called.