As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COCKPIT TEMPERATURE CONTROL VALVE HEARD SQUEAKING FOLLOWED BY NO CONTROL OF TEMPERATURE TO COCKPIT.(<P><SPAN>PERFORMED OPS TEST ON A/C SYSTEM COOLING AND HEATING. HEARD NO NOISE, WORKS GOOD AT THIS TIME IAW AMM 21-48-00. COLD AND HOT SETTINGS OK.</SPAN></P>)