My Game Relay is exactly as shown in your photo, Retro, and it appears to be fine (tightened switch gaps anyway).

I'm wondering if I have wrongly identified some of the components in the machine, which would be confusing my understanding of the startup procedure. Hoping the folks here can confirm or correct me and fill in the gaps. (see photos)

Backbox
1.   Ball count unit
2.   Match unit
3.   Replay unit (according to sticker) This also termed the credit unit, right?
4.   ??
5.   100pt relay
6.   1000pt relay
7.   ??
8.   Score reset relay

Playfield left
1.    ??

Playfield right
1.   On bumper relay
2.   ?? 500 pt relay unit
3.   ?? 500 pt relay unit

Cabinet
The labels are still on everything here, so I know what they are.

Q. Where is the "bonus unit" and the "bonus relay"?