What was found
FLAPS FAIL CAUTION MSG IN FLIGHT AFTER T/O. FAILED AT 0 DEGREES. PERFORMED TROUBLESHOOTING PER BOMBARDIER FIM REV 39 IAW AD 2009-06-12 PARAGRAPH (H)(6)(I) AMOC DATED MARCH 27 2009 TR# 27-012 PER AMOC DATED DECEMBER 18 2009 AND PA AD27-052G. REMOVED AND REPLACED LEFT BPSU IAW AMM 27-51-10. OPS CHECK GOOD. FECU CODES- 12 1A, 12 2A, 12 1A, 12 2A, 25 BC. OK FOR SVC. VERIFIED PART EFFECTIVITY.