Catalogued under schematics, a 147 KB PDF carrying just the part code 2N6756. No model, board number or revision appears in the name. The JEDEC 2N scheme identifies discrete semiconductors, so the file is probably a datasheet with maximum ratings, electrical characteristics and outline dimensions. It supports identifying leads for meter checks and choosing equivalents with sufficient ratings. Verify that the physical package and printed code on the board match the document before using it.
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.