1. Turn off your mon­i­tor, then turn it on by simul­ta­ne­ously press­ing the three but­tons cir­cled in blue above (Menu, Plus, Power).
2. To access the ser­vice menu, press the but­ton cir­cled in yel­low above (minus).

Exit the ser­vice menu as you nor­mally would. To return to nor­mal user mode use the soft-power but­ton to turn the mon­i­tor off and back on again.

This should also work great with 2404WFP, 2405WFP, 2406WFP, 2407WFP, 2704WFP, 2705WFP, and 2706WFP where those pan­els exist (maybe not some years). My guess is the 3008WFP will also use the same com­bi­na­tion — I don’t know about ear­lier years as they had fairly dif­fer­ent dis­play pro­cess­ing hardware.