What was found
AFT FUSELAGE, UNDER TOILET AREA, RH GUSSET BEAMS, FROM FR 61 TO 59, BOTH HAT BEAMS HAS SIGNS OF CORROSION AT BOLT HOLES 4 EACH. BLENDED OUT CORROSION AND EVALUATED AT RH GUSSET FROM FR 59 - FR 60 FOUND TO BE OUT OF LIMITS. REMOVE DAMAGE GUSSET, LOCATE AND DRILL NEW GUSSET AND INSTALL NEW GUSSET. APPLIED ALODINE, PRIMER AND TOPCOAT. CORROSION LEVEL 2