A schematic print would be nice.

You're dealing with older 737's if I remember correctly.

The interphone system on this aircraft would be considered analog.

Which of the ARINC standards pertains to the cabin interphone system? Is ARINC 746 the correct specification in this case?
Are the cabin interphone system and the cabin telecommunication unit considered the same system?

On the 767, all auto-pilot actuators are the same part. There are nine total. 3 each for pitch, roll, and yaw.
  
  
On each servo there are line replaceable electrohydraulic servo valves and shutoff valves.
  
     
  
     
  
     
  
We recently had an aircraft with a center auto-pilot that was not engaging.  The MCDP checks showed a failed command circuit for the rudder (or directional) servo. The rudder servos are inside the vertical stabilizer.
  
     
     
  
When the valve was checked from the Center FCC, a reading of approx 1100Ω was seen.
  
     
     
  
You would think "I've got continuity so the valve is good", but that would be wrong.

There are actually two coils wired in parallel. 1100Ω is the resistance of "one" of the coils.

When two coils of basically the same value of 1000Ω are wired in parallel, total resistance is about half the value of one.
  
     
  
When the replacement valve was plugged in, the value read at the FCC rack dropped to about 500Ω.
  

       
  
It should be noted.... the servo (or shut-off) valves plug into the case of the actuator. If we had the same resistance reading with the replacement valve, we would most likely have a open wire internally "in" the actuator. That would suck as now the whole unit would require replacement.
  
     
     
 

Leach relay P/N BACR13CJ2 causing a cycling "FLAP/SLAT ELEC" warning on the lower EICAS display.
  
     
  
This is different from the posts above because this one has a 115 VAC coil. All previous intermittent relays were direct current.
  
  
This particular one was failed for about 90 seconds and energized around 10. (I wouldn't have caught it if I wasn't looking at the EICAS screens for another reason.)

When failed the message was in view.

I pulled the relay and checked for power (X1) and ground (X2). These inputs never dropped off. I then jumped the 115VAC and a separate hard ground to the removed relay. It dropped off within 10-15 seconds after power was applied.

A new relay fixed the problem.

In the schematic below, the EICAS computers do not want to see a ground on "F3" of the "D" plug. If a ground is present..... the warning will display.
K730 has 115 VAC available all the time. It's looking for a ground to energize. That ground comes from the Flap Slat Electronics Unit on pin "K13" of the "B' plug. If the FSEU is operational, it will provide that ground and there will be no warning present.
  
  

Old, but it still gives some good information.
Same system on 767.
  

  

Glad you got it working, share a picture of your print once it comes out.

Your awesome! This one looks great.

Actually after looking back in my files I had already started a new one in CAD it has dimensions as well, its slightly bigger than the one i posted above I wanted to slightly increase the size because depending on how the pins were put in they could kind of get stuck. I never finished cleaning it up but attached is another STL and Autodesk file with dimensions.