Saving modified "Cold and Dark" panel state?

[1290SASRider 26]

Good evening! I’m trying to create a panel state that is essentially cold and dark with external power already connected and available.  With the battery and Standby Power off all CDUs are dark and so I’m unable to access the menu to save this state.  With PMDG in FSX there was the option to load and save panel states from the Add-Ons drop-down menu but of course there is no provision to do so in P3D.  I opened the panel state file and considered editing it but I’m concerned that I’d miss some detail and word not allowed up the panel state file and possibly crash the sim.  Any idea how I can accomplish this otherwise?

[funkyhut1 7]

Press and hold MENU on the CDU?

[1290SASRider 26]

59 minutes ago, funkyhut1 said:

Press and hold MENU on the CDU?

Well, I thought that's what I'd read and tried without success.  That worked. Guess I just hadn't pressed and held MENU long enough.  Thank you!