As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK INOP. GROUNDED - YES. PACK OPERATION SHOWED LITTLE TO NO AIRFLOW, LEFT PACK DUCT TEMP ROSE TO 95C AND AUTO SHUTDOWN OCCURED, ILLUMINATING PACK LIGHT. INSPECTED DIFFUSER/PLENUM, FOUND ACM IMPELLER BLADES BROKEN, DAMAGED. REMOVED AND REPLACED L/H PACK ACM PER B737-900 AMM 21-51-04. OPS CHECK GOOD.