'Undiscovered' mission after completing it - glitch?

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I've been playing Borderlands: The Pre Sequel. I finished the mission Fresh Air, and I got a reward for completing it.
The next day I did all other missions, but I have seen it's undiscovered, and I can't do anything to start it.
What can I do? I'm playing on the PS3.
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What is the undiscovered mission in the fridge?
Mission TypeNote for Self-Person is an optional mission in Borderlands 2 given by ECHO Recorder dropped by a goliath inside of The Fridge. It becomes available after both Bright Lights, Flying City and The Cold Shoulder are complete.Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Harrison Haines, Rachel Claire, Kony Xyzx, Art Guzman