What was found
WHILE AIRCRAFT WAS IN FOR HEAVY CHECK, MAINTENANCE REPORTED LEVEL 2 CORROSION ON PAX CABIN FLOOR RT INBD SEAT TRACK UPPER SURFACE AT FR 84, MAINTENANCE PERFORMED CUTOUT AND INSTALLED DOUBLER REPAIR ON THE PAX CABIN FLOOR RT INBD SEAT TRACK UPPER SURFACE AT FR 84 IAW SRM 53-23-10. REF MATERIAL USED 7075-T6 .080 ON ISSUE TAG A92815, PO 1457917. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.