As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A B-CHECK INSPECTION, LEVEL 2 CORROSION FOUND ON INNER SIDE OF FUSELAGE SKIN TRIPLER LOCATED AT THE FORWARD BOTTOM CORNER OF THE AFT LAVATORY SERVICE PANEL CUT-OUT. THE TRIPLER WAS REMOVED AND REPLACED PER DER JOSSIAR DRAWING 72R5331098. AIRCRAFT RETURNED TO SERVICE.