Help me "flick a relay" (QSC USA 1300 Amplifier)

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ghostinthemachine

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I have a QSC USA 1300 amplifier here of a friend. The B channel speaker relay is not engaging. At first I thought the channel is dead but after poking around with the oscilloscope I confirmed that its not the case. It produces signal up to the relay and I confirmed this audibly. 

Looking at the schematic it could be caused by a few things.

Anybody got some pointers for me whilst I am poking around some more?

Thanx in advance!
 

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