What happened to my airport extreme that airport utility says used to be part of my network but no longer is found?

   I have been working on regaining wireless printing from my MacBook and just discovered something new to me. I brought up Airport Utility and received a screen display showing my network. The diagram box for the Airport Extreme  has a warning icon and clicking on the diagram box for the Airport Extreme  brings up the message that my airport extreme cannot be found and that it USED TO BE part of my network.  The only help given is to check the device and make sure it is plugged into power, within range and connected to the Internet.  Its been a long time since I last set up the Airport Extreme, but it is powered up, in the same place and connected to my cable modem as before.  I continue to  have wireless connection to the Internet from my MacBook and iPhone. What I do not have is wireless connection from the the MacBook to my Brother Printer as I did until, for unknown reasons, it stopped working.
So far, I have checked all the help for the printer problem and wonder if my problem is in the Airport Extreme?  The printer does find the Airport Extreme, but still does not print wirelessly, only by attaching it with USB cable to the MacBook.
Resetting the Airport Extreme will wipe out that setup, but should I do this anyway?  Might it help the printer problem.
Thanks for your help. I've worked on this a long time using available material. 

    I see now that long questions are not going to be read and answered.  Understandable.  Since writing this I got help on one aspect of question and now have Airport Extreme visible through Airport Utility and it seems to work.   However the wireless printer still does print. On the printer's screen, it recognizes my wireless network and connects. When I try to print from the MacBook, the usual printer icon comes up, but with Printer is Offline.  Printer is Not Connected.  So far, nothing in Apple or Brother help has given me answer to this problem.  Any ideas would be appreciated.

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