Potential Neck Issue with 2003 MM Sterling

Hi there! I bought a new 2003 MM Sterling in high school, and it has been my #1 ever since. It’s perfect, and is my favorite thing I own. I recently had the tech at the music shop I work at set it up, and he mentioned that the truss rod is almost maxed out.

Is there anything I can do about it? I want to keep this bass playing great for years to come, and if there’s something I can do to alleviate my potential truss rod problem, I’d love to know about it. I’ve heard about putting washers at the end of the truss rod, but is that possible with Ernie Ball style necks, or even a good idea in general?

If there isn’t anything I can do, is it possible to get a new neck made by Ernie Ball? From what I can tell, the chances of that are pretty slim.

Thanks for your help!