Ma Audio Hk-401sx low low output

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A local pawn shop had a posting on cl that they have few amps to sell cheap as non working so i got them all .This Ma audio still had the warranty seal intact so no on have ever worked on it .Unit will power on fine and has good positive and negative rail voltage 50 volts but audio is low low and at max gain i can hear 3 watts max.The output is clean audio and operating all switches/knobs dosent change the out level at all .Amp idles at 3 amps no protection light ,screen reads 13v input and 61F tem .No parts appear damaged or burn
 
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