What was found
L/H AFT LOWER EXTERNAL FUSELAGE SKIN CORRODED AT TOILET DRAIN OUTLET BETWEEN BS 907 AND BS927 AND STRINGER S-21L AND STRINGER S-21L .BS907.0-BS9027.0,STR 21.0L- STR22.0L. GROUNDED - YES. REMOVED CORROSION ON FUSELAGE SKIN AT LAVATORY VENT AT STA 917, BETWEEN STR-21L AND STR 22LORIGINAL THICKNESS 0.125, REMVOED 0.054", REMAINING 0.071" FOUND TO BE OUT OF LIMITS B737-800 SRM 53-70-01-1A-1.ACCOMPLISHED A CATEGORY "B" REPAIR AT STA 910 TO STA 924, STR 21L TO STR 22L IAW B737-800 SRM 53-70-01-2R-3 REPAIR 3. THIS REPAIR HAS INSPECTION THRESHOLD OF 50,000 FLIGHT CYCLES AFTER AIRPLANE DELIVERY PER TABLE 202 OF REPAIR 3.T8224K EXP 17/OCT/23 PO#1034790.1 [P# 891789.1.