I checked the TDI website and could not find a class they offered called 'O2 Service Technician'. According to what I saw, they have a class called 'O2 Service Technician Instructor'. Years ago TDI did have the prereqs for all their classes listed on the website, that must have changed. I do remember Steve Lewis saying there is a disadvantage to listing on the web, Standards and Procedures for each class. If I remember right, the thinking is it is harder for an instructor to teach the class exactly
like he wants to. Depening upon where a class is taught and under what specific conditions the instructor has some leway as to how the class is taught. As far as what the OP said when he started this thread, I believe he was suggesting that a person had to have a certification from a MANUFACTURER not an employee of a LDS.
P.S. Jim,,,I have a light switch that is in need of repair..It won't stay up !