As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PACK L 1) OVERHEAT AT LT PACK OUTLET OR LT PACK COMPRESSOR OUTLET OR LT PACK FLOW CONTROL VALVES (FCVS) ARE CLOSED DUE TO: FCVS FAILED CLOSED, FCVS LATCHED CLOSED BY CABIN TEMP CONTROLLER (CTC) BECAUSE OF FAULT, OVERHEAT, OR PACK FLOW SENSING FAILURE, OR BOTH FCVS FAILED IN ANY POSITION. REPLACED LT UPPER FLOW CONTROL VALVE AND TESTED OK ON MAT LT SYS AIR ON TEST. STATUS MSG CLEARED.