Checked out the wiring on the EAA chapter scales I borrowed. Scale 3 would not zero out. Reinserted and secured the plug pins with no improvement. There was a section with electrical tape which I removed to inspect. It looks like a cut was covered, but I could not tell through the shielding if any actual wires had been damaged, but I think it is likely. I retaped and marked the correction amount on scale 3. Will see what the chapter wants to do if anything. near as I can tell, the only issue is rembering to add a correction to the reading.