The filesystem and all services have been restored and are back to normal. Our efforts to repair file corruption in the file system were not entirely successful. Following instructions from IBM, we made four attempts to execute their file repair program, and it failed or hung each time. However, each run did make progress, and a large number of filesystem errors were fixed. Experience tells us that we can run as-is without undo risk. After we hear back from IBM regarding the weekend's activities, we will carefully consider if or when we need to try this again.