Kenwood KA4002 problem

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dicksolder

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Joined 2010
I've got a 30 odd year old Kenwoon KA4002 amplifier with the following problem: the left signal goes dead most of the time presumably due to a hot connection because if you give the amp a slight knock it works fine. The problem gradually became worse over time and now the left signal is dead most of the time.

Any ideas on where to start looking for the problem? Where can I find circuit diagrams for this amp to start debugging?
 
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