Hello.I found a Pioneer sx-838 receiver at the junk that someone had thrown out.Some of the controls (volume,bass,and tuning knob broke.Repaired the controls,both a couple new knobs,cleaned it all up,recapped the power supply and tone boards and she looks and sounds awesome!One problem,right channel reads 0dc at the speaker terminal and 30mv dc offset.(excellent)Left channel 30mv dc offset but 250mv dc left channel output.Any ideas on possible problem?Thanks for any advice!Tom