Battery keeps draining

2015 Almera. Car has had a new battery, and a replacement for it, but after a day or two the car will still not start - lights come on but are dim. Indicators don't come on.
We had a local electrical expert come and check the car and he replaced one section of the Management system (new board), but the problem remains. He is adamant that there is nothing wrong with the electrical system.

Anyone have any thoughts?
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