Need help trouble shooting my BK ST 140

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I have a BK ST 140 witch has one channel that works normal and one channel that is very weak and thin unless I turn the balance all the way to that side and crank up the volume high but even then then the bass is nearly non existent...I have swapped speakers, cables, interconnects and source so I know for sure the amp is the issue...I am an electrician but I'm no electronics tech...If any one had this issue and has resolved it I would greatly appreciate some feedback...thanks:confused:
 
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