As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YUL- DURING 4C INSPECTION YUL MAINTENANCE FOUND HEAVY CORROSION AT FR9 ON EACH SIDE OF THE SPLICE AT BL 0. RT SIDE OF FR9 REPAIRED IAW ATR42 SRM 53-11-40 FIGURE 403. LT SIDE REPAIRED AS PER COEX EC5310-01204. AIRCRAFT RETURNED TO SERVICE.