As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 9429 - FLAPS FAIL CAUTION MESSAGE AFTER FLAP RETRACTION, FLAPS FAILED AT ZERO DEGREES. FOUND A LARGE AMOUNT OF PACKED SNOW AND ICE IN THE LEFT INBOARD FLAP COVE AREA OF THE WING TRAILING EDGE. AFTER REMOVING DEBRIS, FLAPS RESET. INSPECTED LEFT FLAP SYSTEM, NO DEFECTS. FLAP SYSTEM, OPS CHECK GOOD.