I'm away from home and the service manual, but the "no horn" may be quite a clue.

RCM. (Relay Control Module)

The RCM is a known troublemaker that causes a 'no crank' condition and can also cause a "crank but no start" when it causes the fuel pump to not have power.
Resoldering ALL contacts and pins on the RCM is the answer in this case.

More info here:
https://www.crossfireforum.org/forum...-no-start.html