Hi Dave.? To be honest looking at the Schematic with the populated PCB below does not make any sense at all with the 15 relays.??
The top 7 relays clearly show the contacts Normally CLOSED
The Bottom 7 relays show the contacts normally OPEN and in that position they are connect to nothing as shown with a red cross.
S8 relay is shown in the Normally CLOSED position so totally and utterly confused from that drawing.? Regards? Dave? G4RVH