What was found
ODORS IN COCKPIT / CABIN: WE HAVE NOTICED AN INCREASING ODOR IN BOTH COCKPIT AND CABIN OF THE AIRCRAFT. SMELL IS A MUSTY/DIRTY SOCK TYPE SMELL. SEAMS TO BE MORE PREVELANT WITH BLEED OFF OF THE APU AND WHEN PRODUCING HEAT. DISCONNECTED, CLEANED & RECONNECTED DRAIN TUBE FROM WATER EXTRACTOR IAW AMM 21-52-29-400-801. NO WATER NOTED, A SHARP BEND IN RUBBER DRAIN TUBE NOTICED PRIOR TO DISCONNECTING TUBE. DISCONNECTED, CLEANED & RECONNECTED FLEXIBLE DRAIN HOSES IAW AMM 21-52-13-000-801 / 21-52-13-400-801. NO BLOCKAGES FOUND. DISCONNECTED, & RECONNECTED TUBE FROM WATER EXTRACTOR TO PRECOOLER IAW AMM 21-52-29-400-801. NO DEFECTS NOTED. PRESSURIZED A/C SYSTEM IAW AMM 21-00-00-862-801 & 21-00-00-862-803. NO ODORS.