The £30 amps clamp wil do the job just fine , have you access to a compressor and air blower , squirt Wd down the handle button and blow it out then see if you can get the button to work in the data blocks .
If he doors have individual fuses for the out station ecm yes pull that to issolate that door then see if the battery is getting dragged down
When you get your amps clamp you can see what it is pulling when asleep and you will be able to pull fuses to issolate electrical circuits and see the difference on the amps draw , rather than guessing if there is a higher amps draw than the norm .
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