What was found
FLT 4571 - DURING APPROACH INTO YUL FROM ATL, UPON SELECTING THE FLAPS TO EIGHT DEGREES A FLAP FAIL CAUTION MESSAGE WAS RECEIVED WITHT THE FLAP INDICATOR SHOWING ZERO DEGREES. THE QRH WAS COMPLIED WITH AND THE CREW REQUESTED EMERGENCY VEHICLES TO BE ROLLED AS A PRECAUTION. A ZERO FLAP LANDING WAS ACCOMPLISHED WITH THE AIRCRAFT LANDING SAFELY. MAINTENANCE INSPECTED THE FLAPS AND RESET THE FLAPS SYSTEM IAW ASA EO 600-27-0004. NO DEFECTS WERE NOTED AND SYSTEM OPERATIONS WERE GOOD. UPON FURTHER INSPECTION MAINTENANCE FOUND THE LEFT AND RIGHT NR 1 AND THE RIGHT NR 4 FLEX SHAFTS DAMAGED. MAINTENANCE REMOVED AND REPLACED THE LEFT AND RIGHT NR 1 AND THE RIGHT NR 4 FLEX SHAFTS. OPERATIONAL CHECKS GOOD. AIRCRAFT