if you like music and enjoy decent sounds in your car my advice is to put aftermarket kit in. the bose was probably an ok system over 20 years ago ... not now!
the difference is night and day on a decent upgrade without going mental and spending k's!
i put decent amp, speakers and small sub in by JL Audio in and totally transformed the system
obviously if not big into sounds you may prefer to send your amps etc to Kaz for fixing ... or you may want that OEM feel with the nice cassette deck to look at
"The value of life can be measured by how many times you soul has been deeply stirred" - Soichiro Honda