As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK TRIP OFF AFTER TAKEOFF. RESET BUT ELECTED TO RETURN TO DEN PER FIM TASK 21-62 TASK 835 BIT ZONE TEMP CONTROLLERS FOUND TRIM VALVE ZONE FAULT PER FIM TASK PULLED CB''S TO RESET VALVES. THEN BIT ZONE TEMP CONTROLLER BOXES AND NO MORE FAULTS AND BITE TEST PASSED. LEFT PACK OPERATED NORMAL.