As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
*** WHILE AIRCRAFT WAS IN FOR HEAVY CHECK *** MAINTENANCE REPORTED LEVEL 2 CORROSION ON THE L2 DOOR LOWER SILL BEAM. MAINTENANCE REMOVED AND REPLACED THE L2 DOOR LOWER SILL BEAM IAW E170 SRM 51-43-01, 51-10-03 & 51-43-02. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.