What was found
DURING HEAVY MAINTENANCE, CORROSION WAS DISCOVERED ON RH MAIN CAVIN SHEAR WEB FRAME SUPPORT FR 69-70 STR 23R LOWER SURFACE; REMOVED AND REPLACED RH AFT CABIN SHEAR WEB SUPPORT FR 69-70 STG 23R IAW SRM 51-72-11, 53-41-14 FIG 002. WORK ACCOMPLISHED ON HAECO NR 440519-36655.