As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COE HEAVY CHECK / LEVEL 2 CORROSION: LT AFT PAX/CREW DOOR THRESHOLD PLATE HAS AREAS OF CORROSION ON TOP & BOTTOM SURFACES. REMOVED CORROSION IAW ATR72 SRM 51-21-42, REVISION 78 AND ATR72 SRM 51-21-58 REVISION 78. FOUND TO BE OUT OF LIMITS. REPLACED THRESHOLD WITH OEM REPLACEMENT.