If you haven’t completely stripped a bike down to service it, I would thoroughly recommend it. It gives you an opportunity to check, service/replace every component and deep clean everything. My tip would be to photograph everything, mark the exact position of the front mech with a tiny dab of tippex and label up all the outer cables.
once completed you have the comfort of knowing that your bike is genuinely back to “as new” condition. Next one of my bikes to receive the full strip down treatment will be my 2007 Specilized Epic which I doubt has ever been completely stripped.