As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3760 (BUF TO DTW) FLAPS FAIL AT 20 ON APPROACH WHEN SELECTING FLAPS FROM 20 TO 30. REMOVED AND REPLACED LEFT FLAP BPSU IAW AMM 27-51-10. OPS CHECK GOOD. REMOVED AND REPLACED FECU IAW AMM 27-51-05. OPERATIONS CHECK GOOD. PERFORMED TROUBLESHOOTING PER BOMBARDIER FIM REV 44 IAW AD 2009-06-12 PARAGRAPH(L)(6)(I) AMOC DATED DECEMBER 07, 2012 AND PA AD 27-052J.