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You will need a digital multi meter that reads DC AMPS and then disconnect the positive cable from the battery and connect the meter in line and close the doors and leave the key off and out of the ignition. Specs for current amp draw is 0.001 amps. Then you will have to remove one fuse at a time and check the meter reading and then reinstall the fuse and go to the next fuse till the meter reads 0.001 or really close.
It does take a while to locate and isolate the cause of the current draw.