As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING PHASE A2 INSPECTION IRNZ2620021, SIGNIFICANT CORROSION WAS FOUND IN THE RIGHT ENGINE FIRE EXTINGUISHING TUBE P/N: 4526208502-009. LOWER RIGHT FIRE EXTINGUISHER BOTTLE ELBOW TUBE WAS FILLED WITH WATER. LEFT TWO WAY CHECK VALVE P/N:52000505-1 HAD SIGNIFICANT CORROSION INSIDE BODY. RIGHT TWO WAY CHECK VALVE P/N:52000505-1 WAS FOUND TO BE CORRODED INTERNALLY AND THE CHECK BALL SEIZED.