Hiya,
Try disconnecting the speaker cables, then turn it up and see if it protects. If not, then connect one speaker at a time (on very low volume otherwise could pop the amp) and see if you can identify a faulty speaker/channel. Then try a known working speaker on the amp channel that is giving problems (to eliminate a fault with the amp). If the known working speaker also trips the amp, then it is that channel faulty. Hopefully you get away with a bad speaker wire though!!
Best of luck
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