Thanks for your help.

>>>What is the symmetric key encrypted with?

>>>If it's a certificate or asymmetric key, are you able to open that key explicitly?

The symmetric key is encrypted with a Certificate.

No, I am not able to open the key. When I try to open the key with the statement:

OPEN SYMMETRIC KEY SymKey

DECRYPTION BY CERTIFICATE Cert

I get the error

Msg 15466, Level 16, State 1, Line 1

An error occurred during decryption.

I have also imported the Service Master Key from the original server and I still have the same problems.