As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM, L PACK DOES NOT COOL. OUTPUT TEMP 28C WHEN COMMANDED TO FULL COLD. LEFT PACK CONTROLLER SHOWED NO FAULTS LEFT PACK HEAT EXCHANGER HAVE NO DAMAGE EXTERNAL OR AT COOLING FINS. REPLACED FLOW CONTROL AND SHUTOFF VALVE IAW AMM 21-51-01-404. SYSTEM TESTS OK.