[AllHailKingVolvo]

Hi all,
Over the last few months the horn on my diesel 940 estate has gradually declined from a sort of skronky, furious-goose-like honk to nothing but a desultory clicking noise from under the car when I hit the button.

Before I dive in and order a replacement horn unit, is there anything else that could be causing the issue? Any relays or similar that may have gone bad?

Thanks in advance for any and all advice!
Phil