Datasheet-type PDF of roughly 41.9 KB for the 5LN02SP, placed in the schematic category. The name gives just the part code; in this series LN appears to stand for the N-channel MOSFET variant and SP for the package. Use the sheet to identify the gate, drain and source pins, check threshold voltage and drain current, and read maximum ratings before testing in diode mode. Make sure the package and marking on the board agree with the document before ordering a replacement.
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.