Rolleiflex 6008 meter and aperture issue

I just bought a Rolleiflex 6008.
Manual shutter speeds work perfectly, but none of the automatic modes (aperture-priority or program) work at all.
The problem is that the aperture value is never displayed in the viewfinder — only the shutter speed is shown, and only when I select it manually. In automatic modes the shutter speed is always stuck at 4" (if I turn the exposure compensation dial, that value changes, but nothing else happens).
I suspected a metering issue, removed the focusing screen and discovered a torn/broken flex cable (ribbon cable).


It’s pretty obvious that this is the cause of the failed exposure metering.
My questions:
Can this broken flex cable also be the reason why the aperture value from the lens is not displayed in the viewfinder, even when I set the aperture manually on the lens?
Is there any service manual, repair guide, video or at least some tips on how to replace this ribbon cable?
Or at the very least — how to safely remove the side panel and the mirror box to get access to it?
Thanks in advance for any help!

I found how to dismount side panel and mirror. Temporarily soldering thi wires and metering works. Well, that means, i need to make new flexible cable.

But the problem with the diaphragm remained. Where should I start looking for the issue? Could the problem be a lack of contact that transmits the diaphragm value to the camera?

You might try contacting Dave at Key Camera in Colorado. He may have the part or suggestions for repair.