As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED TEMP IN ZONE EXTREMELY HOT. HAD TO SHUTOFF TRIM AIR. CABIN TEMPS ARE VERY UNCOMFORTABLE. VERY HOT IN BACK AND VERY COLD IN FRONT WITH LIMITED AIR FLOW. PASSENGERS AND F/A`S FELT ILL. INITIAL ISSUE WAS ZONE A, TEMP CLIMBED THRU 90+ DEGREES, HAD TO TURN OFF TRIM AIR. REPLACED ZONE A TRIM AIR VALVE AND ACFT GROUND CK NORMAL. TRIM AIR SYS TEST PASS IN CMC.