As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF CREW HEARD LOUD BANG AND FELT VIBRATION COMING FROM THE NR 1 ENGINE. AIRCRAFT RETURNED TO PHX, DECLARED EMERGENCY AND LANDED WITHOUT FURTHER EVENT. MAINTENANCE BORESCOPED THE NR 1 ENGINE LPC AND HPC, FINDING DAMAGE TO THE HPC STAGES 7, 8 AND 9. MAINTENANCE REMOVED AND REPLACED THE NR 1 ENGINE IAW AMERICA WEST AIRLINES TASK CARDS R5M71001 AND F8M71001. OPERATIONAL CHECKS WERE GOOD.