What was found
SJO - LEFT WING NR 1 FUEL TANK RIB CRACKED AT WBL 135.5 IN AFT SECTION, BETWEEN REAR SPAR AND STRINGER 16. REPAIRED LEFT WING LOWER CHORD AT WBL 135.5, BETWEEN STRINGER 2 AND STRINGER 3 PER BOEING SB 737-57-1186 DATED APRIL 13, 1989 SECTION 3, PART 3, FIG 3. (M)