As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION AT STA 344 R/H MOST OUTBD FLOOR SUPPORT JUST AFT OF R-1 DOOR (CIRCLED IN RED). GROUNDED - YES. REMOVED CORROSION. ORIGINAL THICKNESS 0.080 IAW B737-900ER SRM 53-10-15-0I-2. REMAINING THICKNESS AT BLEND AT 0.079, REMOVED 0.001 BLENDED AREA WITHIN ALLOWABLE LIMITS IAW B737-900ER SRM 53-10-15-1A-2. ALODINED IAW B737-900ER SRM 51-20-01. PRIMED IAW BOEING SOPM 20-41-04. MARKED BLEND AREA IAW B737-900ER SRM 51-20-01.