I suggest trying this:
Go to the Literature Grid:
http://www.kaba-ilco.com/access_control/literature/literature_grid_mechanical_pushbutton_locks.aspx?id=13and hover your mouse over PDF under the TIPS (rightmost) column for the L1000
Then click on the lower choice that pops up: "How to Reset a Lost or Unknown combination....."
Yow will then download the file with the instructions that you need.This is a PDF file; if it won't open for you, you need to download and install Adobe Reader (it's free):
http://get.adobe.com/reader/If you are not successful, please contact the Tech Suport for Kaba-Ilco:
Technical Support (Simplex, E-Plex, PowerLever, 4000 Series, Solitaire 850L, Solitaire 850/950)
1-800-849-8324 (option 3, and then option 6)
I hope this helped. Good luck!