As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON APPROACH, THE PILOT SELECTED FLAPS AND THE COMPUTER SENSED A FAULT. A FLAPLESS LANDING WAS CARRIED OUT. THE SUBMITTER BELIEVES THAT A SMALL AMOUNT OF WATER, EVIDENT ON THE LEFT UPPER FLAP SKIN, HAD FROZEN AND CAUSED THE FLAP TO STICK IN THE RETRACTED POSITION.