What was found
UPPER FUSELAGE MAIN CABIN, AT STA 986, BTWN RBL 50 AND LBL50, FLOOR BEAM UPPER FLANGE WITH CORROSION IN SEVERAL PLACES.(<P>REPAIRED FUSELAGE FLOOR BEAM AT STA 986.5, UPPER CHORD SECTION BETWEEN LBL 50" AND RBL 50" I/A/W COOPESA COO-EO-2025-22114-R00 REV:00, DATED: APR 01-25 AND BOEING MESSAGE COO-TLS-25-004016B DATED APR:01-25. APPROVED AND DOCUMENTED ON F.A.A FORM 8100-9 REFERENCE ID 202503170131-0008 DATED APR 08-25. NOTE: THIS IS A DAMAGE TOLERANCE CATEGORY C REPAIR, AS DEFINED IN B-737-800 BFC S.R.M 51-00-06, WHICH REQUIRES THAT THIS REPAIR BE REPLACED OR MODIFIED TO A CATEGORY A OR B REPAIR WITHIN 3,000 FLIGHT CYCLES FROM REPAIR INSTALLATION, A/C CURRENT CYCLES: 31573.</P>)