Checked my old listings with the Fairfield, and they do not list their email address anywhere. Even my old bookings do not have an e-mail for the hotel directly. I also checked my elite account, and alas no e-mail address. You might want to PM them on their FB page, they seem to answer that one.
You can give them a call at 714-772-6777 if you need to chat with them. I have done this and got special requests taken care of prior to arrival.