As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEFECT NR00222: L2 MOP SEAL HAS AREAS OF CORROSION (MARKED). - - - RESOLUTION: EVALUATED CORROSION ON MOP SEAT L2 FOUND TO BE OUT OF LIMITS, REMOVED AND REPLACED MOP SEAL PER B737-800 SRM 51-40-02-0G AND DWG #147A8501 REV B. SRM REF 53-70-15-1A-1. CAUSE OF CORROSION: MOISTURE.