How do I restore Airprint in my HP M451dn printer?

I've been successfully using my HP LaserJet Pro 400 M451dn via Airprint (I think as it appeared on my iPhone (iOS6). Then one day it no longer appeared. I don't understand what happened to cause it to fail. I printed the Config Report and it shows Airprint under Installed Personalities and Options. So why doesn't it work?
Bob

Restart your router. Unplug it and let it reset.
While you do that you might as well power down the printer and restart the iPhone also.
Power everything back up, and AirPrint should be restored.

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