What was found
REFERENCE NON ROUTINE CO50131. DURING C3 C-CHECK, INSPECTION NOTED NUT PLATE HOLE ON R-2 DOOR SILL, AFT AND OUTBOARD OF R-2 AFT GIRT BAR ATTACH FITTING WAS CORRODED. MX INSTALLED REPAIR DOUBLER IN ACCORDANCE WITH THE REQUIREMENTS OF ENGINEERING AUTHORIZATION NR A9-53R-30582. UPON COMPLETION OF THE REPAIR, IT WAS INSPECTED AND FOUND ACCEPTABLE.