As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLAPS FAILED TO EXTEND. FOUND MESSAGES 27-21021 AND 27-20431. REPLACED FSEU NR 1 IAW MM 27 -51-01. RAN FLAPS TO FULL EXTEND AND BACK. STILL HAS FLAP-SLAT CONTROL 1 MESSAGE ON ECAM. MESSAGE IS DEFERABLE. SWAPPED FSEU 1 AND 2, PROBLEM FOLLOWED. DISPLAYED CH 27 FLAP SLAT ON LOWER EICAS, SHOWED FSEU 1 FAILED. REPLACED FSEU 1, MSG CLEARED. SOFTWARE OK.