Just got a 82 300sd. Great car have a few issue though can I get some advice on some of the stuff

1. The central locking sytem is not working. the vacuum and switch works. I think there is a leak some where. the fuel door and trunk are the only ones that work.

2. The power antenna is not working.

3. The carpet on the rear deck lid is faded pretty bad. anyone know where I can just buy the carpet stuff or replace the entire thing thanx.

Can anyone help me out?