What was found
(AIRCRAFT NOT GROUNDED) (DISCREPANCY DISCOVERED DURING AIRCRAFT HEAVY MX VISIT) NRC 2000-0070: (1684-027) AT R1 DOOR SILL BEAM FOUND CORRODED AROUND FASTENER HOLE AT AFT GIRT BAR FITTING AREA. / R 1 DOOR LOWER SILL BEAM CORROSION REMOVED AS PER SRM 51-74-00 REV 149 AND FOUND WITHIN LIMIT PER SRM 53-11-14 283 005 REV 149.REPAIR MAJOR CATEGORY B WITH FUTURE INSPECTION LISTED IN SRI 53-11-14-205-001 REV. 149 THRESHOLD FROM 1ST FLIGHT AT 60000FC/FH NOT RELEVANT, INTERVAL; TBD. METHOD; TBD SEE AWS FOR DETAILS AND NDT REPORT MWO 585564-36."