pdc assembly failure part not available

After having past electrical problems, not reported, this matter tops the lists of frustrations! I am told that the

reason the alarm went off while driving the car was due a failure in the PDC Assembly. Okay lets fix it,as we

done with rest of the electrical issues. I am told sorry we cannot fix or replace the assembly because they are

no longer available! What? So where do I go from here? Their response, NO RESPONSE!