Slow boot and no bluetooth

One lovely evening, I rebooted my Mac and was greeted with the white screen of death, or more specifically a 10 minute boot time with no Bluetooth one it booted. USB keyboards work, though not at boot, so AHT, SMC reset etc are not available. Using nvram to start verbose mode, it shows every few seconds a 'AppleUSBHubPort::FatalError' on multiple ports.

The device is currently on diagnostics on a repair company, though they already told me they are going to give up, as they have no clue on what it could be. (It is an unauthorized repair shop)

Any clues on what I could do to prevent a 600€ board replacement? I sadly do not have proper soldering equipment at home to replace some chips myself, though that would probably end badly anyway.

Thanks in advance!

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