UPDATE:
The score motor is fixed! I found a tiny blob of solder stuck to the underside of the switch assembly. I have no clue how it got there but I guess it goes to show how important it is to check the switches. Sorry if I've been a bit dim I think all the other problems can be addressed now. Thanks everyone for your great help and replies. I'll try and upload some photos when it's done.
The score motor is fixed! I found a tiny blob of solder stuck to the underside of the switch assembly. I have no clue how it got there but I guess it goes to show how important it is to check the switches. Sorry if I've been a bit dim I think all the other problems can be addressed now. Thanks everyone for your great help and replies. I'll try and upload some photos when it's done.