A follow up to retinadoc's post since it is locked. Have used carstereohelp.com to rebuild the Bose head units for both of the Z's I have owned. Current unit has been working great for 11 years and counting since rebuild. Great work and quality service.
They can also add an AUX input to the head unit.
Follow Ups
Bose repair and AUX input. - ElectroZ22:29:30 11/13/17