What was found
PHX - AIR TURN BACK - FLT 0158 - ON CLIMB OUT OF PHX EN ROUTE TO STL NOTICED A MODERATE AIRFRAME VIBRATION LEAVING FL 180, TURNED BACK TO PHX, VIBRATION CONTINUED THROUGH DESCENT AT FL 10 VIBRATION CEASED. MAINTENANCE REMOVED AND REPLACED R/H TURBINE FAN ASSEMBLY IAW T/C R2C21002, OPERATIONAL CHECK WAS GOOD. **SUPP** REPAIR VENDORS INCOMING INSPECTION OF TURBO FAN S/N 212085 FOUND FAN SEIZED, OPERATIONAL TEST COULD NOT BE PERFORMED. DISASSEMBLY OF UNIT FOUND CATASTROPHIC DAMAGE CAUSED BY BEARING FAILURE IN TURBINE SECTION, UNIT BEYOND ECONOMICAL REPAIR, SCRAPPED AT VENDOR.