What was found
WHILE AC WAS IN FOR HEAVY CHECK, CORROSION FOUND ON CENTER FUSELAGE 3 RT INBOARD SEAT TRACK BEAM AT CROWN TEETH LOCATIONS FR 60-84. REPLACED SEAT TRACK BEAM PN 170-86082-005, IAW SRM 51-43-03, 51-43-04. SEE AAR NRC 4500836-2000-0110 FOR WORK PERFORMED. A/C REMAINS IN YQG FOR COMPLETION.