As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CORROSION WAS FOUND ON ALL 3 ENGINE INTERMEDIATE CASES ON THE AFT FLANGE. IT WAS DISCOVERED DURING C1 VISIT. ENGINE MFG CONTACTED. REPAIR TEAM WAS SENT TO ACCESS AND REPAIR CORROSION TREATED IAW MM. SUSPECTED CAUSE OF CORROSION IS FROM DISSIMILAR METALS IN CONTACT, STEEL HARDWARE IN CONTACT WITH MAGNESIUM INTERMEDIATE CASE, INCONJUNCTION WITH LOW FLIGHT HOURS.