What was found
FLT#207, BOS-BNA. ' ON VECTORS FOR APPROACH TO ZOL BNA. LEVEL AT 3000FT, AP & AT ENGAGED SPEED SELECTED TO MAN 180 KTS. UNCOMMANDED (RETARD) ANNUNCIATED IN THE AUTOTHROTTLE ACTIVE IMA DISPLAY. SPEED OBSERVED AT 150KTS AND RAPIDLY DECELERATING. THE A/P & AT WERE DISCONNECTED AND THE AIRCRAFT WAS RECOVERED AND LANDED ON A NORMAL FLIGHT PATH; ITEM HAS NO HISTORY AND IS CONSIDERED A NUISANCE CASE PER AIRBUS ISI A220-ISI-22-30-001. A/C OK FOR CONT SRV. MCC JUAN NOTIFIED.'