Mixing Amplifier problem - No Sound Output to Right Terminals

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Hi, I own a Voco Pro DA-8900 Pro Digital Karaoke Amplifier.

Recently when I turned it on to listen to music, it only outputed sound
to left speaker but not to right speaker.

At first I thought the problems could be cable problem or my right
speaker is dead. So I tested by swapping right speaker to left
terminal of the amplifier and vice versa, then I got sound from right
speaker and left speaker which was connected to right terminal of
amplifier had no sound. So I know that is not my right speaker or my
cable problems.

I did open the top case of the amplifier to see whether there is any
component burned. So far, I dont see anything noticeable.

Please give me more hints so I can continue to troubleshoot the
amplifier.

Thank you.