As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) UNIT SENT FROM THE USA FOR RECTIFICATION OF SEAL LEAKS. DURING DISSASEMBLY EXCESSIVE CORROSION WAS FOUND IN ONE OF THE VALVE MANIFOLD ATTACHMENT BOLT HOLES. BORE NOMINAL DIMENSION IS 6.4MM, BORE OVERSIZED TO 7.4MM AND CORROSION DAMAGE REMAINED. PART SCRAPED. BORE POSSIBLY DAMAGED DURING A PREVIOUS INSTALLATION OF THE BOLT.