What was found
ON APPROACH INTO ORD, THE CREW EXPERIENCED A FLAP FAILURE AT 20 DEGREES. THE CREW AND DISPATCHER BOTH FOLLOWED THE QRH AND THE FLIGHT LANDED NORMALLY WITHOUT INCIDENT. AN EMERGENCY WAS DECLARED. AIRCRAFT REMOVED FROM SERVICE, REF WO 299221 MWC'S NR 1-4, NR 6-9 FOR CORRECTIVE ACTION. R & R LT BPSU. REMOVED PLACARD AND REMOVED FROM MEL, REF MWC NR 2 FOR RII.