I have just received a Yamaha stereo system from my parents including the following: AV-34 receiver, K-30 tape deck, GE-30 equalizer, T-32 radio tuner, and a P-30 turntable. My receiver doesn't work all too well. The front channels work alright, but the rear ones don't work at all unless you turn the front channels off and turn the rear ones all the way up, then you can barely hear it, and recently I have lost a lot of bass during playback. I don't really know anything about stereos or receivers, but i'd like to get this thing working like new, and I'm looking for any help or suggestions to get me there. Thanks in advance.