What was found
CORROSION-AFT WET AREA RT INTERCOSTAL FR90-91 AREA UNDER AFT AVIONICS RACK. REMOVED AND REPLACED INTERCOSTAL AT RT FR90-91 AREA UNDER AFT AVIONICS RACK, REF SRM 51-40-08. RESTORED SURFACE PROTECTION PER SRM 51-23-04, 51-23-05, 51-23-06. AIRCRAFT REMAINS IN HEAVY SEE W/O H6456 SN 362 FOR WORK DETAILS CHECK BNA.