What was found
DURING HEAVY MAINTENANCE: PASSENGER CABIN, UPPER SURFACE FLOOR BEAM STRUCTURE, BTW FR 18 TO FR 20, 'Y' -1292 WITH CORROSION; UPPER SURFACE FLOOR BEAM STRUCTURE, BETWEEN FR 18 TO FR 20, 'Y' -1292 WAS REPAIRED, THIS REPAIR IS CATEGORY "A" NO FUTURE ACTIONS REQUIRED I.A.W. A320 SRM 53-11-14-300-003 REV 149 MAY.01/24 ALL WORK ACCOMPLISHED ON MMEXICANA WO 1282422, 131- 2003 NR 00586.