As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB ZONE TEMP ON RECALL. GROUNDED - YES. BITE CHECK OF NR 2 ZONE TEMP CONTROLLER SHOWS FAULT ON FLT DECK TRIM VALVE, VERIFY STEP PASSES. PERFORMED FIM 21-62 TASK 842 AND PERFORMED PACK TEMP CONTROLLER BITE PROCEDURE 1 & 2 IAW FIM 21-62 TASK 801. UNABLE TO FIND FAULT AFTER BITE 1 & 2 TEST. GROUND VERIFICATION COMPLETE.