What was found
AFTER LANDING, STARTED APU DURING TAXI IN. ENGINE BLEEDS STILL ON & APU BLEED AIR OFF. NOTICED A FAINT SMOKE ODOR & SHORTLY AFTER, AN AMBER CAS MESSAGE FOR ACM OVERTEMP. RAN CHECKLIST & AFTER SHUTTING ENGINES OFF & NEVER APPLYING APU BLEED AIR, AMBER CAS MESSAGE DISAPPEARED. PERFORMED GVI OF ACM BLEED DUCTS FIRE LOOP & COMPONENTS, CLEANED & INSPECTED CONNECTORS AT ACM COMPRESSOR OUTLET SENSOR IAW AMM 21-50-00 & 21-50-45, PERFORMED TC 68A-21-181006MR1, THOUGHTOUT TASK CARD & OPS CHECK OF ECS. NO SMOKE ODOR PRESENT IN COCKPIT OR CABIN AREA. NO AMBER ACM OVERTEMP CAS MESSAGE POSTED WHILE PERFORMING TC & OPS CHECK ALL TEMPERTURE READINGS WITHIN NORMAL OPERATING LIMITS.