A 95 KB PDF filed under schematics and labelled simply 124nq, without a voltage suffix, board number, revision or product name. The code reads like a rectifier series name, so the sheet likely lists several voltage grades of one part family. It can be opened in any PDF viewer. Use it to compare ratings and package dimensions when a diode in a power stage has failed short or open, and read the full suffix on the physical component to pick the correct grade from the table.
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.