As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE REMOVED DUE TO FLUCTUATING OIL PRESSURE. TURBINE DISASSEMBLED DUE TO LOW POWER ON TEST CELL. DISASSEMBLY INSPECTION REVEALED: CRACKED BEYOND SERVICEABLE LIMITS ON EXHAUST COLLECTOR STRUT & EXCESSIVE RUNOUT ON CARBON SEAL BORE .006 (SPECS.0015) INSTALLED A DALLAS AIRMOTIVE OVERHAULED EXHAUST COLLECTOR.