Our technician was able to check the node and found out the OOB (Idrac) and RAM component had failed. We've replaced the RAM and brought the node online.
In order to make sure the issue won't affect our customers in the future, we've scheduled a quick migration of all servers on this node and will be completed in ~3 hours. Updates will be followed once we have made progress!
All servers are currently online, we will add an update on when the migration started.