The file is a 56.2 KB PDF listed under schematics and labelled 1T408, with nothing else in the name to tie it to a specific product or board. The code reads like a discrete component part number, so expect reference material for a single device rather than a full circuit diagram. Any PDF viewer will open it. Use it to check terminal assignment, ratings and package dimensions when diagnosing or replacing the part. Make sure the suffix printed on the component agrees before trusting the figures.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cyberlanelectonik. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.