What was found
LEVEL 2 CORROSION, UPPER FUSELAGE, PASSENGER CABIN ON FR 20 AT Y-765 SEAT TRACK WITH CORROSION. REPLACED PASSENGER CABIN SEAT TRACK AT Y-765 BETWEEN FR12 AND FR24 IAW SRM 53-11-15-01A FIG 001 ITEM 040-A, SRM REV 158-00 AND INSTALLED IAW DWG D53112812, ISSUE E, SHEET 02, ITEM 3, DWG D53110900, ISSUE L, SHEET 08, & DWG 53110784, ISSUE B, SHEET 01. (LP: 1791327, AIRCRAFT WAS GROUNDED)