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Battery leakage via mystery live dashboard circuit

My 2014 Berlingo had a recurring flat battery when I collected it 2 years ago which was then replaced by the dealer. The battery went flat again over a longish period of time. 
The car was examined by an Auto Electrician and found to be charging ok with no other faults. 
He advised a new battery if the problem recurred which it did. 
One frosty night late 2023 I noticed part of the windscreen remained melted. 
Located over the DAB aerial and at two spots over the radio area. 
A tiny heat source from a live circuit.
The DAB aerial has now been removed (and wires cut) but on a frosty night the two patches over the radio still remain melted. 
Disconnecting the radio has had no effect...there is still a tiny source of heat from the dashboard area as if there is a live circuit.
Has anyone had this problem? 
The DAB set-up was probably wired incorrectly but there are no details as to how it bypasses the sleep mode and remains live, so I am looking for a fix. 
Any clues?
I don't know about the Berlingo specifically, but some other vehicles with climate control have a temperature sensor sometimes called a "hegehog". If these go faulty, the cabin fan can run at a low speed.

Could that be what you are seeing?


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