Right side speaker not working on my Mac pro

Hello
I have 15.4" Macbook Pro retina display. Realised a weeks ago that my right internal speaker is not working. Any way I can make it work or something I need to check, or should I take to apple care ?
Regards

System Preferences > Sound > Output > Internal Speakers/Headphone
Settings for the selected device:
Balance:
Make sure that the slider is set at middle.
Applications/Utilities/ Audio MIDI Setup.app
Audio Devices window
Side Bar
Click the Built-in Output.
Make sure that CH1 and CH2 volume sliders are matched.
Best.

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Right side speaker not working on my Mac pro

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