As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PUSH BACK ENGINE START GOT AIR CON RECALL WITH CONTROL CABIN ZONE TEMP LIGHT; CLEARS WITH RECALL RESET. GROUNDED - YES. R/R L/H TEMPERATURE CONTROL VALVE REF B737-800 AMM 21-51-10/401, NO LEAKS NOTED, BITE TEST PASSED. CONTROL CABIN ZONE TEMP LIGHT EXTINGUISHED, OPS CHECK FOUND NORMAL.