What was found
AFT PIT LT BS 1070 MAIN FRAME CORRODED, CRACKED AT AREA UNDER SIDE PANEL O/B OF STR-27L (SHEAR TIE). REMOVED CRACKED SHEAR TIE IAW B727 SRM 51-30-2, FABRICATED NEW SHEAR TIE FROM BAC1505-10210 7075-T73 POX NR 7161380 (DIM 5.50" BY 2.25") IAW B727 SRM 53-10-2 FIGURE 5 AND 51-20-1. INSTALLED NEW SHEAR TIE AT AFT PIT LT BS 1070 MAIN FRAME O/B OF STIR 27L AFTER TREATING AND PRIMING NEW SHEAR TIE IAW B727 SRM 51-10-2. INSTALLATION PERFORMED IAW B727 SRM 51-30-2.