What was found
DURING HANGER MAINTENANCE, THE RT INBOARD FLAP INBOARD FIXED TRACK SUPPORT WAS CRACKED. MAINTENANCE INSTALLED A TEMPORARY REPAIR TO THE FLAP TRACK SUPPORT RIB IAW THIS EO SETS THE FLIGHT LIMIT NOT TO EXCEED 400 FLIGHT HOURS BEFORE THE PERMANENT REPAIR IS DONE AND ALSO STTES THE RIB MUST BE REPLACED AT THE NEXT (A) CHECK. MAINTENANCE REMOVED AND REPLACED THE CRACKED FLAP TRACK SUPPORT RIB.