As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO REGULATE FLIGHT DECK TEMP IN AUTO MODE. WITH DECK RHEOSTAT SELECTED TO WARM AND TRIM VALVE POINTER ON "W", COLD AIR STILL COMES OUT OF THE GASPERS. AIR EVENTUALLY BECOMES TOO WARM, BUT THEN CYCLES TOO COLD.(<P>CLEANED FLIGHT DECK ZONE TEMP SENSOR FILTER IAW AMM TASK 21-61-00-107-027. SUCCESSFUL BITE TEST OF ZONE TEMP CONTROLLER PERFORMED IAW AMM TASK 21-61-03-715-022.</P>)