Part 80EBU02 gives its name to this 146 KB PDF, filed as a schematic but most likely a rectifier datasheet in International Rectifier numbering style. There is no device, brand or board number involved. The document is useful for checking pin configuration, package outline and maximum ratings when a diode in a supply circuit is suspected of failing. A sibling 80EBU04 sheet exists in the index, so confirm the exact marking before relying on these specifications for a replacement.
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.