Parity error-2

What you sent doesn't seem to fit in with your previous issue on the SGU.
It's talking about the Flight Mode Annunciators, but I understand where you're trying to go with this as a comparison to your original problem.

Your reference is talking about SSM in relation to a 429 bus. It is saying the identifier for parity is wrong..... just like your SGU fault.

You need to verify the jumpers on the SGU rack. One is broken or open. It could be a pin pushed back, a wire broken of the back of the pin, or a wire is broken or disconnected from the junction splice. These can be checked with a Ohm meter. Start pinning the rack to find out which pin doesn't have continuity to the rest of them in the group. YOU MUST HAVE A "ODD" NUMBER OF JUMPERS CONNECTED.
  
     
     
 

This is a typical 767 SGU. The pins circled are parity pins. These go to ground, but it doesn't matter if they're hooked to each other also.

You need to find the pins on the prints for your aircraft and find out if one is not connected.....