As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACM WAS INSTALLED AS AN OVERHAULED UNIT. OIL SERVICE AND NEW WATER SEPARATOR SOCK INSTALLED. GROUD RAN SYSTEM, DID COMPLETE OPS CHECK NO LEAKAGE. 50.6 HOURS AFTER THE ACM WAS BINDING INSIDE, MAKING A LOUD SCRAPING NOISE. UNIT WAS REMOVED AND REPLACED WITH A WARRANTY UNIT. ACM WAS RETURNED TO MFG FOR EVALUATION.