As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING SCHEDULED MAINTENANCE LEVEL TWO CORROSION WAS OBSERVED BELOW THE PASSENGER DOOR SILL AT STRINGER 21P BETWEEN STATION X310 - X319. MAINTENANCE CARRIED OUT REPAIR/REPLACEMENT OF THE AFFECTED PARTS, BACK-UP SILL FRAME, & INTERCOSTAL.