Trying to repair my NHB-108 clone

I bought a Dartzeel NHB-108 clone from AliExpress (Queenway) a little more than a year ago. It sounds absolutely fantastic, and I have been really happy about the purchase.

However, one channel has started to fall out from time to time. Sometimes it happens after 2 minutes of listening, other times it will play for hours before failing.

Seller has asked to me adjust bias and check the output transistors.

But... Since its a dual mono construction and one of the power LEDs has stopped working as well, wouldnt it make more sense to check the left channel PSU? I am tempted to just try swapping the PSU from one channel to the other to check if that will move the problem to the other channel.

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The LED is always off, so it doesnt follow along with the sound coming and going. But its the same channel.