As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB ZONE TEMP LIGHT ILLUMINATES DURING RECALL. GROUNDED - YES. T/S PER B737-800 FIM 21-62 TASK 801 BITE OF PACK TEMP CONTROL AND FOUND FAULT ON RIGHT TEMP CONTROL VALVE. REPLACED RH TEMPERATURE CONTROL VALVE REF B737-800 AMM 21-51-10 OPS CHECK GOOD NO LEAKS BITE PASSED.