What do the Status Monitor icon colors mean when monitoring my printer?
A green icon indicates the normal stand-by condition, a yellow icon indicates a warning, and a red icon indicates an error has occurred. A grey icon indicates the machine is offline. You can also click the Troubleshooting button within Status Monitor to access Brother's troubleshooting website. (Page 8)
From the official Brother HL-B2080DW Monochrome Laser Printer manual, page 8
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