JBL GTO 601.1

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Hi guys im busy on a JBL GTO 601.1
Mono the amp works but when i play it louder it seems to clip and the protection light flash as it clips I stripped the amp and checked the voltages the rail voltage is +29v -29v i downloaded a manual and it shows rail should be 35v rail to rail what can be the cause of low rail voltage
 
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