What was found
DURING HFEC INSP, ON LT HORIZONTAL STAB, AFT SPAR CAP, FOUND CRACK, ON UPPER SURFACE AND INNER SURFACE OF ONE BARREL NUT. RETAINER IS INSTALLED IN BARREL NUT HOLE. REMOVE FOR TOTAL CRACK LONGEST. REMOVED L/E CTR SECTION HORIZ STAB IAW MM 55-10-02. REMOVED ACCESS DOOR 331AZ IAW MM 6-33-00 AND REMOVED I/B ELEVATOR AND ATTACHING PARTS IAW MM 27-30-01. REMOVED AND DISCONNECTED HYD PIPES LINE ALK7009-596/614/556 AND CUT ALK7014-501 IAW MM 20-10-01-2. REPLACE CAP ALC7472-1 IAW SRM 51-33-01 AND 51-35-01 VOL 2 AND DWG ALC7463. REPLACED ALL PARTS DAMAGED AND CLOSED AREA IAW SB DC10-55-18. ACCOMPLISHED EA NR 8-5510-103679.