- Folder 1: Planned Maintenance --- 1989
- Folder 2: Planned Maintenance --- 1990
- Folder 3: Planned Maintenance --- 1991
- Folder 4: Planned Maintenance --- 1992
- Folder 5: Planned Maintenance --- 1993
- Folder 6: Planned Maintenance --- 1994
- Folder 7: Planned Maintenance --- 1995
- Folder 8: Planned Maintenance --- 1996
- Folder 9: Planned Maintenance --- 1997
- Folder 10: Planned Maintenance --- 1998
- Folder 11: Planned Maintenance --- 1999
- Folder 12: Planned Maintenance --- 2000
- Folder 13: Planned Maintenance --- 2001
- Folder 14: Planned Maintenance --- 2002
- Folder 15: Planned Maintenance --- undated