Datasheet for the 5LN01SP in PDF format, roughly 28.0 KB, indexed as a schematic. Only the part number is stated; LN in this series appears to denote an N-channel small-signal MOSFET and SP a package. The document is useful for confirming pinout, switching characteristics and maximum voltages when fault finding on signal switching or low-power circuits. Before soldering in a replacement, match the marking on the original part and make sure the package outline fits the footprint.
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.