Assuming the file has not been renamed or relocated the solution is simple. Regardless, the problem is not with ArchiCAD, it is with your work stations connection to the file server. Your finder may be connected to the file server via short cuts or favorites, but unless the finder is connected directly to the Shared FS01 root, the path will go undetected in ArchiCAD and the external content will show as missing. The reason is ArchiCAD can not connect half way through the path name, and the first directory of the path is the WWA-FS01.
The solution is as follows: go to the finder, connect directly to the FS01 server destination under shared. If you do not see the directory link, go to All… and connect to the FS01 server from that menu. Once connected directly to the server, go back to ArchiCAD’s Drawing Manager and Check Status and Refresh the missing drawing files.