2003 P5 with stock radio/CD changer that decided not to give me back the last two CD's as I went to change them out the other day. Pulled the unit to self-diagnose and heard a faint rattle. Gave it a light shake and the smallest gear wheel I may have ever seen fell out. Seems to be the problem. Since the changer separates from the radio unit, I'm looking to obtain just a changer unit and install an MP3 module/Iphone plug to the back of my stock unit while it's out. But having trouble locating the CD changer module. Any help and/or advice to a newbie on Mazdas247 would be a giant help.