When you say you “took all the steps to no avail” do you mean you did the steps requested and submitted a response with what they requested and you’ve heard nothing since - or did they say they needed to push your issue to the next level. If it’s the former then posting here will let them know that communication was dropped. If it’s the latter, they don’t tend to touch base unless they have actual news - which can feel like they’ve forgotten about you, but it’s guaranteed that they haven’t. If that’s the case this post will remind them that you’re feeling lost!
It’s unlikely that anyone here guessing will get you better information than the staff can especially as they have access to the machine logs - but yellow lights, outside of temp issues, generally mean the machine can’t communicate. Can you post pictures of both ends of the white cable connections? Like this: