Doesn't look like she's in a shipyard. This leads me to believe that she's in a Continuous Maintenance Availability (CMAV) which is designed to be performed on a completely operationally ready ship in order to conduct small repairs and refits. This jives with the fact that she's supposedly fully fueled. Before any other maintenance availability, she'd have been completely defueled and unloaded of all ammunition. This means that she may have limited firefighting systems online and have very little impact to spaces that aren't being worked on.
A drydock (DPMA) or SECNAV Restricted Availability (SRA, often conducted pierside) are for conducting serious overhaul of the ship and will make the ship completely non-operationally ready and unable to go to sea. The CMAV should not technically impact seaworthiness or ability to go to sea IAW SURFOR regs.
The CDO and EDO are going to get raked over the coals for this. My guess is that hot work (welding, grinding, etc.) was being performed and the contractors cut corners or didn't follow procedure properly. We'll likely see a full post-mortem in the EDO community in a few months to capture lessons learned and prevent future issues.