What was found
L1 THRESHOLD HAS SURFACE CORROSION AROUND AFT. GIRT BAR FITTINGS AS MARKED. REPLACED THRESHOLD WITH NEW REF. SRM 53-10-11/AD02, 51-40-08, 51-40-02, 51-23-04, AMM 20-10-01 AND TOP COATED SRM 51-23-06. P/N 170-03719-005. SEE W/O H6589 SN 296 FOR WORK DETAILS. AIRCRAFT REMAINS IN HEAVY CHECK BNA.