As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED FLAP FAIL MESSAGE AT 20 DEGREES. PERFORMED TROUBLESHOOTING IAW FIM 27-50-00 REV 51 IAW AD 2009-06-12 PARAGRAPH (H)(6)(I), . FOUND EVIDENCE OF MOISTURE INGRESS AND MODERATE CORROSION ON BPSU ELECTRICAL CONNECTOR. THIS, IN COMBINATION WITH LRU "MOST PROBABLE" MESSAGE STRING LED TO THE R & R OF THE LT BPSU IAW AMM 27-51-10. FLAPS OP CHECKED GOOD IAW AMM 27-54-00.