What was found
ON FLIGHT 3867 (BUF TO DTW) RECEIVED FLAPS FAIL AT 20 DEGREES ON APPROACH INTO DTW. PERFORMED TROUBLESHOOTING PER BOMBARDIER FIM REV 44 IAW AD2009-06-12 PARAGRAPH (H)(6)(I), AMOC DATED DECEMBER 07, 2012 AND PA AD27-052J (DOCUMENT WORK PERFORMED) INSPECTED FLAP ACTUATORS FOR LEAKS & DAMAGE, OPERATED FLAPS 5 CYCLES CHECKED BALL NUTS FOR OVERHEAT ON LEFT WING. REMOVED AND REPAIRED FLAP ACTUATORS 1-1 & 1-2. REMOVED & REPAIRED FLEX SHAFT 2, 3, 4. ALL CHECKS GOOD AT THIS TIME.