The New Mexico Public Education Department (NMPED) has made available a powerful set of resources for NM teachers and administrators at http://teachnm.org. We encourage you to utilize this website when you have questions about teaching-related issues in order to most quickly find your answers and accomplish your goals!
The section of the TeachNM website on SLL is accessed by clicking “Experienced Teachers” at the top and then “Same Level Licensure” - http://teachnm.org/programs/same-level-licensure/sll-for-educators.html
The section of the TeachNM website on the 3-Tiered Licensure System may also be helpful. It is accessed by clicking "Experienced Teachers" at the top and then "3-Tiered Licensure System" - http://teachnm.org/programs/3-tiered-licensure-system.html
Information on SLL renewal requirements can be found at the TeachNM website's SLL section (linked above). From that section: "Same Level Licensure is for those educators who are currently licensed at either level 2 or level 3, and whose license will expire within the next two years."