Battery drain

What you need to do or have a mechanic do, is disconnect the negative battery terminal and place an ammeter inline on DC amp scale around 50 mA, cause that is the maximum the drain should be with everything turned off, key removed and wait thirty minutes after hooking up the ammeter for all the modules to go to sleep.
Then if the ammeter reads over 50mA (0.050 amps), then start removing fuses one at a time and leave them out until the ammeter drops safely below 50 mA, then once you find out which fuse's circuit the short circuit is on, remove the ammeter, hook the battery backup and power up that fuse's circuit and first make sure everything on that fuses circuit does work, cause that may give you a clue as to what to check, so then using a voltmeter or twelve volt test light find out why that item isn't working, so begin testing the wire to the item.
Once you find out which fuse it is, let us know and one of us or I will get you the wiring diagram for that circuit.