Small 39.5 KB PDF for the 2SA1791, indexed as a schematic but named after a JIS PNP bipolar transistor, which points to a component datasheet. The _E suffix is common in Japanese manufacturer document naming for an English-language edition, though the name does not confirm the maker. Look here for the package drawing, pin order, maximum ratings and electrical characteristics. Before fitting a replacement, compare the marking code on the part with the one the datasheet lists.
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.