What was found
FORWARD CAB AND AFT CAB KNOBS SEEM TO BE WAY TOO FAR TO THE LT TO HOLD A COMFORTABLE TEMP, ABOUT 21 DEG CELSIUS, THE KNOBS ARC ALMOST 90 DEG TO THE LT. CONTROL CAB ABOUT 12:30-1:00 POSITION. FWD AND AFT KNOBS ABOUT 9:30 POSITION. ACFT GROUNDED. WITH PACKS ON, VERIFIED DISCREPANCY. FOUND LITTLE TO NO INTAKE AIR FLOW TO PASSENGER CABIN TEMP SENSOR ASSYS, REF AMM 21-61-06, REMOVED SAME FILTERS AND FOUND PACKED WITH DUST. ALSO NOTED CABIN TEMP SENSORS COVERED IN DUST. CLEANED BOTH PASSENGER CABIN TEMP SENSORS AND FILTERS. OPS NORMAL REF AMM 21-61-10 AND CONTROL CABIN AND BOTH PASSENGER CABIN TEMP CONTROLS, OPS NORMAL WITH PACKS RUNNING.