The problem with my radio was cracking and popping noise from the rear speakers. It was not volume dependant, very loud at any volume level, and was intermittent. Other than that the radio worked fine. I've replaced all electolytic capacitors in Bose and in this tuner/amplifier. Also I have a small cooling fan added for the Bose. The problem gone. It would be an easy job if you had experience with soldering/unsoldering PCB. Capacitors are cheap and readily available. If you interested in doing it I have a list of the capacitors needed and some pictures of the inside of the units.
WBR Mike