What was found
DURING HEAVY MAINTENANCE, CORROSION WAS DISCOVERED ON MAIN CABIN FWD WET AREA FLOOR STRUCTURE AT Y254 BETWEEN FR 16 AND FR18 HAS CORROSION ON TOP SURFACE BS FR 16 -BS FR18 STR 23L; REMOVED CORROSION FOUND TO BE OUT OF LIMITS PER SRM 53-00-14-283-002. REMOVED AND REPLACED FLOORBEAM FROM FR 12 TO FR 24 Y254 STR 23L PER SRM 51-42-11 PARAG 2D, 2E, AND 2F. SRM 53-00-14-283-002. REF SERVICE ORDER 440497 NR 20452 FOR ALL WORK ACCOMPLISHED.