This 145 KB PDF, filed under schematics, carries the name 85epf08 and nothing about brand or board. The code resembles a power rectifier designation where the trailing digits often denote a voltage class, but confirm by opening the sheet. Typical content includes forward voltage, reverse recovery, current rating, thermal resistance and outline drawings. Technicians rely on such sheets when a diode in a switching supply fails short and an equivalent must be chosen with the same voltage, current and recovery speed.
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.