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 2ND MOST AFT NUTPLATE CLIP AT THE L2 DOOR LOWER SILL BEAM. MAINTENANCE REMOVED AND REPLACED THE 2ND MOST AFT NUTPLATE CLIP AT THE L2 DOOR LOWER SILL BEAM IAW E170 SRM 51-41-01, 51-75-16 & 51-40-02. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.