As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE RUNNING THE RT PACK, THE PACK TEMP ROSE THROUGH 80 C, NO AIRFLOW WAS EXITING FROM RAM AIR DUCT. ACFT GROUNDED. FOUND THE R/H ACM TO BE SEIZED AND MISSING ONE BLADE. REMOVED AND REPLACED THE RIGHT PACK AIR CYCLE MACHINE PER B737-900 AMM 21-51-04. OPS AND LEAK CHECK GOOD. PACK TEMP NORMAL. AIRFLOW NORMAL. ETOPS GROUND VERIFICATION ACCOMPLISHED.