What was found
DURING HMBV INSPECTION, QC FOUND CORROSION BETWEEN FRAME 13 - 14, STRINGER 19L - 19R. ACFT WAS REMOVED FROM SERVICE FOR HMBV INSPECTION & WILL BE RETURNED TO SERVICE AFTER HMBV INSPECTION. CUT OUT DAMAGE, FABRICATED & INSTALLED REPAIR PARTS IAW ERS-EM-53MR-539.