As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT PIT LH TRANSITION FROM FS 727 TO FS 847 HAS CORROSION AT MULTIPLE LOCATIONS. GROUNDED - YES. REMOVED CORROSION FROM AFT PIT LH TRANSITION FROM FS727 TO FS847 AND TRANSITION WAS FOUND TO BE OUT OF LIMITS IAW B737-800 SRM 53-00-53-1A-2 FABRICATED AND INSTALLED NEW LH TRANSITION IAW B737-800 SRM 51-40-02-0G-0.W= 5" O= .040" R= .019" L= 2" D= .021".