What was found
ON FLIGHT 4141 FROM MSP TO CID RECEIVED FLAP FAIL AT 14 DEGREES DURING EXTENSION ON APPROACH INTO CID. FLAP SYSTEM WAS ON MEL 27-50-00 DUE TO PREVIOUS FAILURE EARLY IN THE DAY. PERFORMED TROUBLESHOOTING PER BOMBARDIER FIM REV 4 IAW AD 2009-06-12 PARAGRAPH (H) (6) (I) AMOC DATED APRIL 19 2012 AND PA AD27-052H. COMPLIED WITH STEPS 1-22,8-20 NA PER CHECKLIST OF CRJ200 FLAP HEALTH CHECKLIST. COMPLIED WITH STEPS 8-12 & 55-83 IAW CHECKLIST PROVIDED & AMM 27-50-00. REMOVED AND REPLACED NR 2 FLEX SHAFT ON LT SIDE IAW AMM27-53-10. REMOVED AND REPLACED NR 1, 3 AND 5 FLEX SHAFTS ON RT SIDE IAW AMM 27-53-10.