Anybody Familiar With The Fuse Boxes?

[BenRM]

Hi there,

I've a new (to me) 2008 Land Cruiser Invincible, with the large-ish satnav screen that also controls radio, aic con etc. I'm having a problem with the radio presets. If I leave the car for any length of time, when I return, they've vanished and have reset to factory default. The clock, however, continues to tell the right time.

I was wondering whether this is a fuse, disrupting what should be permanent power from Battery to whatever "remembers" the radio presets. Does anybody happen to know what fuse this might be? (Or have any other ideas?)

Many thanks for any help....

- B