As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLAPS FAILED CAUTION MESSAGE WHEN SELECTING FLAPS 20 ON GROUND. PERFORMED TROUBLESHOOTING IAW FIM, REV 44 IAW AD 2009-06-12, PARA (H)(6)(I) AMOC AND PA AD 27-052L. FOUND TO BE CAUSED BY INCORRECTLY RESET SDU. COMPLETED RESET IAW AMM 27-51-15. FLAPS SYS OPS CHECKED GOOD IAW AMM 27-51-05. OK FOR SERVICE.