What was found
NRC 2000-0048: 031-9 AFT PASSENGER CABIN FLOOR STRUCTURE, CORROSION FOUND AT LH THRESHOLD BEAM LOWER MAIN SILL AREA BTW FRAME 66-68. / AFT PASSENGER CABIN FLOOR STRUCTURE, LOWER MAIN SILL AREA BTW FRAME 66-68, LH THRESHOLD BEAM PERMANENTLY REPAIRED AS PER SRM 53-41-14-300-001 FIGURE 001 SHEET 3 PRINCIPLE 5 AND SHEET 5 PRINCIPLE 8. REPAIR CATEGORY A, NO FURTHER ACTION REQUIRED. SEE AWS FOR STEP DETAILS AND NDT REPORT MWO 48857-13 AND MWO 48857-36."