Anyone had to fix anything on their pioneer before? Had my 600 for 10 years and its been nothing but gold. till the other day. When i use the bass eq on channel 3 i get a lot of crackling noise. i moved channel 3 to 4. problem solved. but its really annoying me now. tried searching for the part i need but all the results seem to link me to a new bass eq knob. i dont want the knob, i need the mechanism underneath. can anyone help me out? not sure if you can replace it and if you can what part i need. parts diagram http://site.instrumentalparts.com/DJM600.pdf didn't help me tho.