Named 401CNQ and filed as a schematic, this 160 KB PDF gives no brand, model or board revision. The code resembles a semiconductor family designation without a voltage suffix, so the document likely covers several variants in one datasheet. Look for terminal layout, ratings table, thermal resistance and package outline. Such references are used to confirm the configuration of a rectifier module and select an equivalent for a failed one. Read the full marking on the original component and pick the matching variant.
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.