As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ANNUAL INSPECTION, FOUND CORROSION AND A CRACK BEHIND TURBOCHARGER ON FIREWALL. THE CORRODED AREA MEASURES 8" X 4" WITH A 1.5" HOLE AND 3" PLUS CRACK. RECOMMEND REPLACEMENT OF FIREWALL WITH THE ADDITION OF A FABRICATED STAINLESS STEEL HEAT SHIELD ATTACHED TO FIREWALL, DIRECTLY BEHIND TURBOCHARGER.