What was found
MAIN CABIN, PASSENGER FLOOR BEAM STA 887, LBL 24.75, LBL 45.50, RBL 24.75, AND RBL 45.50 CORRODED ON UPPER SURFACE UNDER EACH SEAT TRACK LOCATION. GROUNDED - YES. REMOVED CORROSION ON THE UPPER SURFACE OF THE FLOOR BEAM AT STA 887 AND FOUND TO BE OUT OF LIMITS, DUE TO NO ALLOWABLE DAMAGE AT SEAT TRACK ATTACH LOCATIONS IAW B737-700 SRM 53-60-51-1A-1. ACCOMPLISHED A CATEGORY "A" REPAIR TO THE FLOOR BEAM AT STA 887, LBL 68 - RBL 68 IAW ASA EA# 700-53EA-20959 REV 00, WITH APPROVED DOCUMENT 8100-9.