The 1SS392 is documented in this 69.6 KB PDF, categorised as a schematic. Because 1SS is the Japanese numbering for small-signal silicon diodes, the file is most likely the manufacturer datasheet. The name has no device, brand or board number. Look here for the package drawing, marking code, forward and reverse characteristics and maximum ratings, which help you identify an unmarked part and pick a valid replacement. It opens in any PDF reader. Verify orientation on the PCB before soldering a new component.
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.