As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT PIT TRANSITION AT RBL-21 HAS MULTIPLE AREAS OF CORROSION BETWEEN STA 727I+6 TO STA 767. GROUNDED - YES. REPAIRED DAMAGED SECTION OF TRANSITION FROM STA 727I+6 TO 767 R/H IAW B737-900 SRM 53-00-53-2R-5.W= 3.00" O= .040" R= .000" L= 3.0" D= .040".