For the CC X2 on the vacuum leak near the controller, our 99 GTP had the same issu, same fix. I ended up replacing all the plastic vacuum lines that run around the Super Charger also, at around 110,000 miles. The plastic had gotten brittle, and one of my wifes quick customizing jobs (she totaled the car 3 times!!!!!) caused them to start breaking.
On the horn, start with the easy stuff, is power getting to the horn itself? If so probably a bad ground or possibly horn. If not check the wiring but it is probably a horn relay or Contacts in the steering wheel.
Good luck
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Jeff R
60 Jaguar Mark 2, 3.8L Automatic
67 Sprint Firebird 230 OHC-6 4-Speed A/C
1971 Fiat 130 Coupe 3.2L SOHC V6, ZF 5-speed
78 Catlina Safari, Pontiac 400 powered
77 Astre Formula, 215 Buick V-8 T-5
73 Lemans Safari, 400 4bbl 4-speed
71 Catalina Enforcer, 455 4bbl
05 Dodge Magnum 3.5L SOHC V6
06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed!
2012 F-150 Echo Boost (My local Ford Dealer SUX!!!)
2020 Dodge Charger Scat pack (recovered)
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