What was found
(AIRCRAFT NOT GROUNDED) (DISCREPANCY NOTED DURING AIRCRAFT HEAVY MX VISIT) (MAJOR REPAIR) NRC 2000-0046: SM (1042-20) REAR FUSELAGE, FR 66 RH, STGR 23, DOOR SILL, CORROSION FOUND AROUND NUT PLATE HOLE / REAR FUSELAGE, FR 66 RH, STGR 23, DOOR SILL PERMANENTLY REPAIRED AS PER SRM 53-41-14-300-001 REPAIR PRINCIPLE 11 REV.154. REPAIR CATEGORY A, NO FURTHER ACTION REQUIRED. SEE AWS FOR DETAILS."