Netgear ReadyNAS Ultra 6 RNDU6000

I have a Netgear ReadyNAS Ultra 6 Review (RNDU6000) that I suddenly couldn't access through my computer last night. The NAS is in my network and is my storage of miscellaneous. It's in a kind of raid 5 but Xraid5 because it's from Netgear. Other computers in my network no longer saw the NAS either. Then tried with the MediaPlayer, but this also did not see the NAS anymore. Then physically looked at the NAS and there I saw that there was no network activity. Tried a new network cable but still the same. Tried another port on the switch and still nothing. NAS taken inside and connected to a switch there and still no network activity. So the NAS has been completely out. There is another network connection on the NAS, but it also does nothing. I have removed the sides of the NAS and see that there is a large print with the network connections on it in the NAS and no separate network card. I have not yet checked whether there are bad solder joints because then I have to remove the PCB. In the meantime, Netgear support created a case and emailed it for a solution. They only direct me to the forum so I don't get any help for my problem. Maybe someone here on the forum knows a solution. All input is welcome.