URGENT PLEASE - One Site in MultiSite Config suddenly not working.

Hi Support -

Strange - We've had multisite for 3 years. We have 3 active sites. We had a DB crash today. After a service restart, one of the sites does not work. Users get the error connecting to DB.

Within WP-Admin, in your sites dropdown, we see the three sites in the list, but the one with problem has a blank name. When you go to that site, it is only showing you the WP admin from the MAIN or Primary site of the WP-ADMIN.

Doing any sort of network update results in an error for that domain and says can not find that URL. We removed the Domain mapping for that site thinking it could be playing a role, but did not help.

Any ideas please?