FWIW the TV still works perfectly, never having required service or maintenance; the picture is still as good as what I see on the best 2021 TVs on display at Best Buy, which is why I haven't replaced it.
14 years later, what with all leading-edge TVs loaded with features including self-calibration and built-in internet connections that automatically and silently update, does it make any sense to pay a significant premium for professional adjustment of "expert/advanced" settings?