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 ILLUMINATED LIGHT EXTINGUSHED WHEN MASTER CAUTION RESET. GROUNDED - YES. ACCOMPLISHED B737-900 FIM 21-62 TASK 801. FOUND FLT DECK TRIM VALVE RED LAMP ILLUMINATED ON PACK/ZONE TEMP CONTROLLER #2. VERIFY TEST PASSES.