What was found
(AUS) RIGHT ENGINE COMPRESSOR AND TURBINE SEVERELY DAMAGED. ENGINE STRIP AND INSPECTION FOUND SEVERE FOD TO ALL COMPRESSOR AND TURBINE STAGES DUE TO A 1/4 INCH HEXAGONAL DRIVE NR 2 PHILLIPS BIT. FROM THE LOCATION OF THE DAMAGE, IT WAS DETERMINED THAT THE FOD ENTERED THE ENGINE GAS PATH THROUGH A BLEED DUCT OPENING WHEN THE THRUST REVERSERS WERE OPEN DURING A PREVIOUS MAINTENANCE VISIT. FOD. PERSONNEL/MAINTENANCE ERROR.