Radio/tape Cd Player problems of the 2006 Nissan Titan

06 Titan le crew cab - stereo just stops - no audio, no power, nothing. This has occurred twice in less than 3 months with complete head unit replacement by the dealership. Dealer states they can not remove the cds from the changer and must wait for factory to do so - I have not had any cds returned to date. Pending other options - persue small claims suit for reimbursement of cds, one more incident of same item will meet IL lemon laws under for impact to material value of the vehicle. . . I like the truck and it functions well except for this more simplistic item and the difficulty in getting repair from a dealer that I did not purchase the vehicle and the number of failures of the same item. Nissan USA has not been materially helpful, only to document but no action. 2nd tires 285/70/r17 - reported to michelin (for bf goodrich rugged trail - oem) tires - have less than 6/32s tread remaining with only 6k miles on tires - michelin will not replace or compensate until 2/32s, though they acknowledge a problem given original tread was 13/32s so more than half tread life is gone in 6k miles.