What was found
FUSELAGE SKIN CORRODED AROUND WASTE VACUUM EXHAUST VENT. GROUNDED - YES. REMOVED CORROSION FROM THE FUSELAGE SKIN AT STA 917, BETWEEN STR-21L AND STR-22L, ORIGINAL THICKNESS 0.125", REMOVED 0.023", REMAINING THICKNESS 0.102" AREA FOUND TO BE OUT OF LIMITS IAW B737-800 SRM 53-00-01-1A-1. REMOVED THE BLENDING SKIN, FABRICATED REPAIR DOUBLER, TRIPLER, AND FILLERAND INSTALED REPAIR AT STA 911 TO STA924, STR-21L TO STR-22L IAW B737-800SRM 53-70-01-2R-3 REPAIR 3. THIS IS A CATEGORY "B" REPAIR WITH AN INSPECTION THRESHOLD OF 50,000 FLIGHT CYCLES AFTER AIRPLANE DELIVERY IAW B737-800 SRM 53-70-01-2R-3 REPAIRS TABLE 202.