It looks like it's nothing to worry about. In Windows power options, is shut down set to hibernation (the default)? If so, change that and I bet it will say AA again.
Assuming that you're talking about code 10 on the add in "G.P. Diagnosis card", it means "Resume from S1" (2.8.3 in ver E4239 of your manual. the download link for the new version is broken on the Asus support page). S1 is a CPU low power state. So it would seem nothings wrong, it's just telling you your CPU has changed power states.
Windows 10 default behavior is that power off causes the system to hibernate, so it would make sense if your seeing code 10 when you first power the PC on.
Unless it says 10 all the time, in which case maybe the add in "G.P. Diagnosis card" or the TPM port could be screwed up or mis-configured. You could try re-seating it and checking for damage. Then again it could just be the way the add-in card was designed, and their could be nothing wrong with this behavior.
Yes, reflashing the BIOS (as you mentioned in the X58 club) and ensuring both BIOS are the same can help solve quirky behavior, but I'd avoid it unless it's necessary. In this case I wouldn't bother, personally.
Intel Xeon W3680 @ 3.9GHz
Dell 0x501h (BIOS A16, not EFI capable)
EVGA GTX 1060 Gaming 6GB 06G-P4-6161-KR @ stock
30GB @ 1066MHz CL7 (3x8GB 2Rx8 1600MHz ECC UDIMMs, 3x2GB 2Rx8 1333MHz non-ECC)
ZFS mirror (media), ZFS JBOD (gaming etc.), ZFS OS
Sunbeam Rheostat Extreme Fan Controller rev2
4 x San Ace 140mm, 2 x Delta AFB 120mm (VRM fans)
CaseLabs Bullet BH8 (white)
Antergos XFCE (Antergos repos removed)
Panasonic Viera X3 TV
CM Storm Quickfire Pro (Cherry Reds)
Itac mouse-trak Industrial Trackball
Creative Sound BlasterX H5 Tournament Edition Headset
Creative Sound BlasterX G1 USB Sound Card
Philips HTS3555 5.1 1000w Home Theater
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