What was found
FLIGHT 2141. AMS CTRL FAULT DISPLAYED AFTER LANDING. MILD INTERMITTAND SWEET ODOR FROM THE AIR VENTS. REMOVED FROM SERVICE. AMS SYSTEM PLACED ON MEL 21-00-01. RETURNED TO SERVICE. MEL CLEARED 2/20. FAULT NOT ACTIVE ON ARRIVAL, INTERROGATED CMC, FOUND FAULT CODE 21001410AM1. PERFORMED FIM TASK 21-00-00-810-803-A, STEPS 1 THROUGH 6(D). ALL CHECKS GOOD. AS PRECAUTIONARY AND REQUESTED BY MAINT, REMOVED AND REPLACED AMS CONTROLLER I/O MODULE- SLOT 21, REF. FIM TASK 21-00-00-810-803-A STEPS 6(E) THROUGH 6(H) AND AMM TASK 21-00-03-000/400-801-A. OPS CHECK GOOD, PLACARDS REMOVED, MAINT. PROCEDURES REVERSED, MAINT. CONTROL NOTIFIED. NFDN. THIS CLEARS DEFECT. RETURNED TO SERVICE.