What was found
CREW REPORTS TEMP ISSUES ON B ZONE DUCT READING, APPROX. 120 DEG WHILE ALL OTHERS AT APPROX. 70-75. ALSO, HAD ODOR IN FLT DECK SMELLED LIKE HOT AIR POSSIBLY BURNING PLASTIC. WORKED WITH CREW AND TURNED TRIM AIR OFF AND RESET ZONE SYS SEVERAL TIMES. TEMPS STABILIZED. ZONE B "DUCT" TEMP STILL READS APPROX 121. SMELL HAS DISSIPATED. WILL NEED TO ACCOMPLISH GROUND CKS OF SYS UPON ARRIVAL. REPLACED GASPER FAN, OPS CHECK NORMAL. NO SMELL FOUND. ALL PACKS RAN 2 HOURS ON GROUND.