As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CABIN ZONE TEMP LT, ILLUMINATES ON RECALL TEMP CONTROL KNOB STILL CONTROLS CONT CABIN TEMP BOTH HOT AND COLD. GROUNDED - YES. CONT CABIN ZONE TEMP BITE TEST ACCOMPLISHED. B737-900 AMM REF 21-62 TASK 801. VERIFY GREEN LIGHT ON NO MX-ACTION REQUIRED.