Turns out it was not fixed by changing the horn relay. Removed the steering wheel airbag and cleaned and polished the clockspring contact in behind. It's been working flawlessly for a couple months now so a partially oxydized clockspring contact was causing the horn to be intermittent.
The relay started making a very loud clicking noise on the times is was
> working so finding it was easy. It is located under the dash behind the
> glove box. If the intermittant problem continues, I'll have to look at
> the steering wheel pad and complete connector. We'll see...
>