Boardview file, 287 KB in .brd format, for a board numbered 09207 with the suffix sb, which probably marks a sub-board or variant, although the name does not state the brand. It sits alongside an sa version, so pick the one whose silkscreen and connectors match your PCB. Open it in OpenBoardView, FlexBV or a similar tool to locate parts by reference, follow nets and find test points while measuring power rails or chasing a short.
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 @one5technology. Enginerys does not host this file.
How to open a .brd file
The most common boardview extension. Several unrelated formats share it, which is why one viewer opens a .brd and another refuses it.