The Aspen 8470 along with millions of other cribs has been recelled dur to issues with the drop-sides.
Here is the CPSP link reguarding this crib:
http://www.cpsc.gov/cpscpub/prerel/prhtml07/07307.html
According to the CPSP information the company appears to be out of business to some degree and are not providing repair kits.
If you know where you purchased the crib, check to see what their policy is reguarding recalled baby products.
We had purchased ours at walmart almost 8 years ago and were able to return it to another store in a different state for a full refund last summer. They did not need a reciept received, they just needed the manufacturer label on the part that the mattress lies on.
Because ours was older, the customer service clerk did have to work hard to find the crip in their system, but once she did, it was not problem at all.