Help? Horn speaker locations / fuses

We had a front end collision in a 2000 Maxima GLE and the body shop did a lousy job fixing it. Our horn sounds more like a "peep" than a horn these days. The fusebox shows 3 horn circuits (3 horn speakers?), but I can only find one. My theory is that some of the horn speakers are either broken, missing, or not connected...

Where are the horn speakers located in the engine compartment for a 2000 Maxima?

Also - how does one determine whether the 3 horn fuses are blown? Not being an expert, I am used to the old "clear" kind of fuses where you could see the metal was either connected or melted...

Thanks for any help you can give. I know this isn't the most exciting topic, but a Maxima with no horn... can be a little dangerous.

Andy
Reno, NV