I have a problem with my Viper 791. The siren stop working. I don't know what to do. I had it installed by a certified alarm guy but not in a shop. the alarm worked fine for 4 months and BOOM the siren stopped. What are my options, can the siren be bypass thru another jumper or whatever.... to make it go off.. or Do I have to buy a new brain..which is basically paying for a new one