What was found
FLAPS FAIL CAUTION MESSAGE (8 DEGREES) AT 4000 FT MSL ON APPROACH INTO DTW. NOTIFIED ATC - DECLARED AN EMERGENCY - DISCONTUNUED THE APPROACH. PERFORMED TROUBLESHOOTING PER BOMBARDIER FIM REV 39 IAW AD2009-06-12 PARAGRAPH (H) 96 (I), AMOC DATED MARCH 27,2009,TR#27-012 PER AMOC DATED DECEMBER 18, 2009 AND PA AD27-052G. REMOVED WATER CONTAMINATION FROM LT NR 4 FLEXSHAFT IAW AMM 27-53-10. OPS CHECKS GOOD. FECU CODES-JAM, PDU DIFFERENTIAL, UNSPECIFIED 5 1A, 5 2B, 17 1B, 17 2A, 9 2A.