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FS039-S Improperly closed file - filename.
Resolution:
The file is corrupt and a backup should be put in place and recovery performed using the Rollforward Recovery Utility. See the section Rollforward Recovery Utility in the chapter Database Integrity for details. If you have specified a backup directory in the database reference file, the recovery will be performed automatically.
If updates to the file have not been logged then the file should be rebuilt using the REBUILD utility.