What was found
DURING PASSENGER TO FREIGHT CONVERSION, FOUND STA 1179, STA 1189, 1219 AND 1229 X= -100 BEFORE INSTALL PANEL ASSY FOR CARGO MOD, FOUND MANY SEVERE CORROSION ON UPPER SKIN OF CTR BOX. REMOVED CORROSION, REMOVED FASTENERS, PERFORMED DYE CHECK RESIDUAL THICKNESS OUT LIMIT, PERFORMED SHOT PEEN THE REWORK AREA CHECK FOR CRACKS AND PROTECT ALODINE AND PRIME (REF EA 1-5710-81787).