As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REMOVED DEFECTIVE ENVIROMENTAL CONTROL UNIT (PACK) AND INSTALLED CUSTOMER SUPPLIED NEW UNIT ASSEMBLY. PERFORMED GROUND RUNS FOR LEAK AND OPERATIONAL CHECKS AND FOUND TO BE SATISFACTORY. ALL WORK DONE IAW AMM 21-00-01 P/N 67000074-1 S/N 259.