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HP Smart Tank 670 All-in-One

I am encountering an issue with my HP 670 printer on my Mac, as it is unable to perform 2-sided printing and is displaying an E4 error. Despite requesting repairs for several months, I have not received any communication via call or email regarding the status of my repair request. This situation is causing inconvenience, and I am seeking guidance on how to proceed.

Please provide assistance on resolving the 2-sided printing issue and any recommendations for expediting the repair process.

Your prompt attention to this matter would be greatly appreciated. Thank you.

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