marykate is correct, yale stopped using that serial number arrangement during the mid to late 90's and went to the 10 digit serial with the end letter designating the year of mfg. If you're looking for a manual you'll need to search for one using the model number GLC030BFN part of the model number.
You won't get one from Yale, they went digital not long after that (around the 2000yr mark) and phased out their paper ones.
If you're lucky someone may have one and copy it off for you or if you want to take a chance with these websites that sell them that's an option, but i wouldn't trust those to be 100% legit giving you the exact one you need.