What was found
LEFT REAR SPAR OF CENTER WING BOX HAS CORROSION AT THE BEARING PLATE. REMOVED AND INSTALLED SERVICEABLE LT REAR SPAR BEARING PLATE IAW ARM 51-40-02. SDR INFORMATION: CORRODED LEVEL 2, PN: 111T1008-1, BEARING PLATE, EXACT FS/BS LOCATION ON ACFT: FROM FS 955 TO LBL 78, EXACT STR, WS LOCATION ON ACFT: FROM CENTER WING TO REAR SPAR. ACFT WAS GROUNDED.