A 41.2 KB PDF titled with the 2SB788 part number, so expect a component datasheet despite the schematic classification. The 2SB prefix follows the Japanese JIS system and marks a PNP transistor for low-frequency work. Nothing else in the name, including the _E suffix, is clearly defined. When diagnosing a failed stage, the sheet helps confirm which leg is base, collector and emitter, what voltage the part tolerates and which gain grades exist. Check that the marking B788 matches.
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.