As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CABIN ZONE TEMP LIGHT WITH MASTER CAUTION RECALL. GROUNDED - YES. PERFORMED BITE TEST ON BOTH ZONE TEMP CONTROLER PER B737-900 FIM 21-62 TASK 801. FOUND FAULT ON #1 ZONE TEMP CONT ( SRADA INLET) AND FAULT ON #2 ZONE TEMP CONT (FLT DECK TRIM VALVE). BOTH FAULTS CLEARED ON CONTROLLERS, RAN PACKS TWICE AND NO FAULTS NOTED AND SYS OPERATED NORMALLY.