As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CORROSION WAS DETECTED ON BOTH ENGINE MOUNTS AND BOTH ENGINES WERE REMOVED TO EFFECT APPROVED REPAIR UNDER RDA AUTHORITY. DURING RE-RIVETING OF ASSEMBLY, IT BROKE IN TWO DUE TO THE CORROSION. IT WAS STATED THAT OVER 50 PERCENT OF THE STRUCTURE INTEGRITY HAD BEEN COMPROMISED. AFTER FURTHER INVESTIGATION, IT WAS DISCOVERED THAT AD 75-23-08R5 HAD NOT BEEN FULLY COMPLIED WITH.