As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO MODE FUNCTION OF FLT DECK IS NO ABLE TO MAINTAIN A DESIRED TEMPETURE , VARIES BETWEEN 17C -28C. PERFORMED FIM 21 64461-FAULT TREE 912 PERFORMED ZONE TEMP CONTROLLER BITE TEST COND NORMAL .NO FAULT FOUNDED. CLEANED FLT DECK TEMP SENSOR, FILTER AND AUTO AND MANUAL MODE OPERATION FLT DECK CONTROL SW CONDITION BACK TO NORMAL CHECK NO FAULT FOUND & SATISFACTORY IAW AMM 21-61-03.