It is not possible to find a 3DES key from a known plaintext / ciphertext pair (it increasingly looks that this is what you're asking). If that was the case then 3DES would either have to be:
- vulnerable with regard to the key size or;
- vulnerable against attacks that invalidate the cipher.
Now although two key triple DES shouldn't be used anymore, it still has a minimum security of around 80 bits (for attacks that are not even applicable in your single plaintext / ciphertext situation).
And, as indicated by the text above, it has certainly not been broken in a sense that you can (easily) recalculate the key. Allowing an attacker to find the full key is as broken as a cipher can get; in general it is assumed that an attacker knows parts of the plaintext.