I just got a 2003 vert with a MACH mp3 radio. I'm getting a error CD message on the display after I eject a CD. Sometimes it plays the CD sometimes I just get the error message. I didn't get an owners manual with the car.Question #1 Is this a 6 CD changer or a single disc? If it's a 6 changer I have found instuctions how to clean the eject rollers. Question #2 If it's a single play does anyone have any suggestions?