A 177 KB PDF for the JEDEC part 2N5655, carrying an RE suffix whose meaning the name does not explain. Although grouped with schematics, the file most likely holds a single-component datasheet. There is no board number, revision or device model to match. Technicians open sheets like this in a standard PDF viewer to check pinout, package dimensions and maximum voltage and current before substituting a part. Compare the body marking of the removed component with 2N5655, as look-alike codes are easy to confuse.
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.