I've had this problem, I still cannot figure out where the leak is coming from. The control module in the trunk underneath all the styrofoam is a Central Door Locking Vacuum Pump. You can find used ones on E-Bay or other resale sites. I've posted a link to one of them to show what they look like. I have no connection to the site and I am not selling any of these, but this is what they look like. When they get wet the electronics in them go bad and corrode. They range anywhere from $150 to upwards of $600 for a new one. They are easy to change out. It really is a do it yourself job, as long as you can master your way through all of the carpet and styrofoam. I'm still trying to find my leak so if anyone has any help in determining that I would appreciate it. I have an '06 crossfire with the retractable ferring. I've seen post about leaks with the stationary ferring but not the retractable one.

https://www.ebay.com/i/323984830797?chn=ps&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=323984830797&targetid=88550476030 5&device=c&mktype=pla&googleloc=9022877&poi=&campa ignid=9343999167&mkgroupid=103102855428&rlsatarget =aud-762207186714la-885504760305&abcId=1139336&merchantid=110882928&gc lid=CjwKCAjw7-P1BRA2EiwAXoPWA2K7bfrBbiiXQ6xm1CNMTgLQFur1x-jSW6b1yl6REUA2UWBjHfwOyhoCS6cQAvD_BwE#

The one posted is for an '00 to '04 but it's the same part number for the '06