My "power it all down" suggestion is because there is/was a bug in the AC12 & AC42 computers that would do exactly this. There is a scenario that I don't currently recall that will lock up the AC and make it un-discoverable by the AP control heads. Power cycling the AC doesn't clear it, so it appears to be a hard problem. After replacing a few ACs as defective, I accidentally discovered that if you power cycle BOTH the power to the AC, AND the power on the N2K/Simnet bus, it would recover the AC. Normally the N2K network is left powered on when you power cycle the AC, and that isn't enough - it will remain locked up. Simrad never fixed it, and I don't know if it carries forward to the newer NAC family of APs.
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