What was found
RT SEAT TRACK FR 12-21; RBL 9.5"- RBL 12.5" HAS CORROSION AND SCORING IN MULTIPLE LOCATIONS MARKED ALONG ENTIRE LENGTH OF UPPER SURFACE. REMOVED AND REPLACED SEAT TRACK BEAM REF. SRM 51-40-08. RESTORED SURFACE PROTECTION REF. SRM 51-23-04, 51-23-05, AND 51-23-06. SEE W/O H6609 SN 419 FOR WORK DETAILS. AIRCRAFT REMAINS IN HEAVY CHECK BNA.