2009 XC70 horn fuse???

[Xcrosie]

Greetings. Brand new member here with an ear splitting issue. There’s something foobar with the horn buttons on my 2009 XC70 and it goes off randomly, sometimes getting stuck for minutes. Super annoying especially when this happens in the dead of night. Until I can tear into it and figure out what’s gone wrong, I figured I would silence it by pulling the fuse. The owner’s manual says there’s a 15A fuse in #29 in the engine compartment fuse box. Except there isn’t. Just an empty slot. I’ve been googling for about an hour and still no joy—everything says it’s #29.

Maybe someone here knows better? Thanks!