I have been having some problems with the Kenwood GX-99 that came with my 96.5' GT-B. It won't accept CDs or tapes. When I try to insert either it will accept them then a few seconds later spit them out. When the tape is loaded I won't even hear the motors kick on to spin the tape. Same with the CD. Also, the volume knob doesn't seem to work. When I was able to tune the radio to an AM station, it only kept at the same volume. Is my head unit repairable or is it dead? I preferably like to keep the head unit in the car. Thanks.