Part 2SK2377 is documented in a 31.7 KB PDF placed in the schematic category. Under Japanese JIS designations a 2SK prefix denotes an N-channel field-effect transistor, so this is most likely a short datasheet. The name holds no further details. Use it to check lead layout and absolute maximum ratings before soldering in a replacement, and to cross-reference equivalents. Always verify the code printed on the component body matches before relying on these 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.