Yamaha Amp

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Hi everyone I have a problem with a Yamaha pc1002 power amp, it works on one channel only, the protection led is on.
When i measure the idle current and dc offset they are correct and i can adjust them on both boards.
This amp has a switch on the back to change from stereo to mono, when switched to mono the volume control for channel A works (it's channel A that doesn't work) in stereo mode.
There are two relays one for each channel channel B relay clicks in but channel A relay doesn't, i tested the relay on a seperate power supply and it worked, the relay driver ic is a TA1317P sil 9 pin ic.
Can anyone give me any advice please.

Thanks in advance mickb.
 
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