As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PUSHBACK ON RECALL CONT CABIN ZONE TEMP LIGHT ILLUMINATED EXTINGUISHED ON RESET OF MASTER CAUTION. GROUNDED - YES. PERFORMED B737-900 FIM 21-62 TASK 842, TEMP CONTROLLER 2 BITE SHOWS FLT DECK TRIM VALVE FAULT ON PREVIOUS FLT LEG, NO FAULTS ON VERIFY. RAN BOTH PACKS AT VARIOUS TEMPS FOR 15 MINUTES. NO DEFECTS NOTED. RERAN BITE. NO FAULTS. THIS CLEARS MEL 21-21G.