What was found
KDEN - FLT 110 - FUMES COME FROM CABIN AIR WHEN WARM SELECTED MANUALLY, COLD SELECTION OK, (DMI NR 608227 DEFERS AUTO CONTROL OF TEMP). RAN ENGINE OPERATED SYSTEM PER MM CHAPTER 21-00 IN WARM AND COLD POSITIONS MANUALLY. COULD NOT DUPLICATED ANY FUMES ON GROUND. ALL DUCTS CHECKED NORMAL, NO DEFECTS NOTED AT THIS TIME. (M)