Check the four fuses on the right side of the power board. One of my GI sockets on the left side failed and shorted out the GI ckt on the left side. Make sure that when you check the fuses that you pull out one side from the socket.

I don't know what you mean by "condition green lights".

You've either got a blown fuse, or the edge connector which carries the GI lighting is burned or partially burned. Look around at all of the GI connectors for burned wires. You will need to replace the connector and probably also the header pins.

You might also have a broken common wire somewhere in the lighting string. If the fuses are good and no connectors are burned, look carefully under the playfield at the sockets which are out and physically trace the wires in the string upstream, looking for a broken wire. It will usually have come off at a socket tab, leaving all subsequent lights downstream out.

Check the relays under the left side of the play field , I'm having to replace one of mine, my whole left side was dark

Hey I have a space station I am restoring for someont and it has the same issue. GI lighting on the right but not left. How do the connectors look that go to the power board? I checked mine and they are burned up and that might be the issue for mine. Have you looked at the connectors on the power board? Also don't rule out "Cold Solder Joints" on the male part of the boards. Where are you located? Perhaps we can collaborate by phone if you want. Send me a PM if interested.

Great glad that it was what we thought. I hope to do the same fix on mine this weekend. Thanks for posting the resolution as it always helps for the next guy.