Kenwood KRC759R head unit CD changer BOSS amp retro old skool car stereo

Kenwood KRC759R head unit x10 CD changer and BOSS amp. mega disc unit back in the day awesome quality and sound presently not working.,it did work fine play cds radio but no idea why it’s now not? it comes with all the wiring and a cassette stuck in it :0) may be of use to someone who’s capable of fixing/repairing it the whole lot is quite heavy hence the excessive postal charge sent signed/tracked postage