It is possible the content you are looking for is contained in the stationary associated with the autoresponder rather than the autoresponder itself. Please follow the steps below to view the content for the stationary, that is associated with your autoresponder.
  1. Edit the autoresponder in question
  2. Determine which Stationary the autoresponder is using under 4. Message Stationery:
  3. Select Email > Stationary
  4. Search for the stationary being used by the autoresponder 
  5. Click Edit for the stationary
  6. Click 3. HTML and update as needed