My '93 555 is going strong and it's had a lot of use. No need for a neck reset yet, thankfully since the pre-NT neck is a bit trickier than the NT neck. Besides a little bellying beyond the bridge she's in great shape structurally, her action is great and the sound? Louder and more sustain than any of my other Taylors, just gorgeous sounding!
The LKSM model is braced differently than the typical Taylor 12er. The bracing is lighter/less strong than stock so the guitar is meant to be tuned down one stop to a "D" I believe. Don't rely on my memory though, google the model...