So the bass EQ on channel 3 of my pioneer djm-500 went a few months ago, so I've switched to channels 2 + 4... and now I've noticed channel 2 seems to be buzzing a bit and sometimes the bass will be on when i've turned it down... I've read a bit on google and found it's a common problem with the connections to become dry and just need re-soldering... So, anyone every done it? Is it an easy job? I've got basic soldering skills and have a couple of mates who are electricians/engineers who may be able to help... But would it be better to send it to someone who has done this sort of things before (i.e. are pioneer mixers tricky?)... any info/experience appreciated!