As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PACK HIGH FLOW INHIBIT CHECK WITH RT OFF, LT PACK DID NOT INDICATE GOING TO LOW FLOW WHEN FLAPS 1 WAS SELECTED. CABIN SHOULD RATE UP, IT RATED DOWN APPROX 600 FPM. ACFT GROUNDED. REPLACED LT PACK FLOW CONTROL AND SHUTOFF VALVE REF AMM 21-51-01. LEAK AND OPS CHECK GOOD REF AMM 21-51-01. REPLACED LT PACK ACM REF AMM 21-51-04. ACCOMPLISHED ACM INSTALLATION TEST REF AMM 21-51-04, TEST GOOD.