What was found
CORROSION NOTED AT FS 364.00 MAIN AVIONICS DOOR STRUCTURE L/H SIDE OF BL 0, AREA CLOSE TO MAIN AVIONICS DOOR SWITCH. INSTALLED NEW INTERCOSTAL P/N: SH670-32075-3 AT FS 364.00 MAIN AVIONICS DOOR STRUCTURE L/H SIDE OF BL 0 AND INSTALLED HST10AG6-( ) HI-LITE + KFN587-3 NUT TO ATTACHMENT ANGLE, P/N: SH670-32114-1 (QTY-3), IN LIEU OF MS20470AD5, DUE TO ACCESSIBILITY. BOTH INSTALLATIONS COMPLIED WITH IAW REO 690-53-21-1770, REV--.