How do I print the Wireless Test Report to troubleshoot network issues?

From the printer control panel, press the Wireless button and the Start Copy Black button at the same time — the Wireless Test Report will automatically print. Check the top of the report to see if something failed during the test, and review the Diagnostics Results section for details on all tests performed. You can also check the Current Configuration section to confirm the network name (SSID) your printer is connected to. (Page 4)

From the official HP Deskjet 2540 All-in-One Printer manual, page 4

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