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It's hard to tell without knowing the fuse number because I have wiring diagrams but no layout diagram of the passenger fuse box.
There is a relay called the 'accessory relay 1' but this controls most of the internal accessories, so most things like radio, lighter socket etc should stop working when it is removed.
There is a fuse (F1R) which is a 20A fuse labeled as 'interior multiplex module' that feeds the accessory relay.
I would try replacing the relay as although I have not seen it it cars before, I have seen the contacts of a relays 'fuse together' so that when the relay should be off and the contacts separated, the contact are still closed. This would mean that the interior multiplex module would stay powered on which would cause the drain.
Currently in martin999's garage:
2011 (11) VW Passat 2.0 TDi SE + options in Island Grey, 2011 (11) Honda CB1000R in Pearl Cool White... oh and a 2004 (54) Secnic II 1.5dCi Dynamique in Ottoman Blue !