What was found
DURING HEAVY CHECK MAINTENANCE FOUND CORROSION AFT WET AREA CENTER FLOOR SPLICE PLATE AT FR90 AS MARKED.REMOVED CORROSION ON PART# 170-86119-006, ON CENTER SPLICE PLATE IN AFT WET AREA FR90. NOMINAL THICKNESS OF .050" WITH MAX MATERIAL LOSS OF.008", AND FOUND TO BE OUT OF LIMITS PER REF SRM 51-75-16. REMOVED AND REPLACED THE PART REF SRM 51-40-08. TREATED, PRIMED AND TOP COATED REF SRM 51-23-04, 51-23-05 AND 51-23-06. A/C REMAINS IN CHECK.