As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON 5+ HOUR FLIGHT NEVER ABLE TO COOL OFF THE FLT DECK. CONT CABIN SUPPLY DUCT TEMP NEVER GOT BELOW 40 C. FOLLOWED MEL OPERATIONS PROCEDURES STEP #2 WITH NO HELP OR RELIEF FROM HEAT. GROUNDED - YES. FOUND LH PACK TRIM AIR VALVE TO BE IN THE OPEN POSITION WITH SWITCH IN OFF POSITION. VERIFIED TEMP CONT OPERATED NORMALLY.