TOA VP-1240B power amplifier

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we have this power amp in our resto here in saudi.the problem is, its showing abnormalities now....when you turn it on, it will give a very loud sound then gradually declining to the appropriate level. is it due to the volume control or probably the speakers network?
 
i dont see any controls elsewhere in the amp itself except for the tone and volume modular circuit board. when i place my hand on the PCB of this modular component, the sound will be normalized............adjustable according to your setting.
 
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