What was found
STRONG SAVORY SCENT NOTICED WHILE APU PROVIDES CABIN AIR. ON ROLLOUT AFTER LANDING, APU BEGAN TO INCREASE AIRFLOW STRONGLY & A SMALL AMOUNT OF SMOKE WAS SEEN, SHUT OFF THE AIR SOURCE CONTROL. FOUND THE ACM FAILED, CAUSED BY RAM AIR CIRCUIT BLOCKAGE, REVEALED INSECT CONTAMINATION IN DUAL HEAT EXCHANGER. R & R THE ACM WITH REPAIRED UNIT IAW AMM 21-52-13. R & R DUAL HEAT EXCHANGER WITH A NEW UNIT IAW AMM 21-52-09. CLEANED, INSPECTED, AND REPLACED ALL SEALS ON ALL ASSOCIATED DUCTING. ALL ACCESSED AREAS LEAK & OPS CHECKED GOOD, NO DEFECTS NOTED. DURING RUN UP NOTED NO OIL, SAVORY, OR BAD SMELLS. CABIN & COCKPIT TEMPERATURE CAN NOW BE ADJUSTED TO BOTH HOT & COLD RANGES WITHOUT ISSUE.