What was found
FLT 1079 JFK-RIC - WHILE IN LEVEL FLIGHT AT 250 KIAS, AUTOTHROTTLE DISCONNECTED DUE TO NR 2 ENGINE ROLLING BACK TOWARD IDLE, F/O (PF) ADVANCED THRUST LEVERS TO REGAIN AIRSPEED NR 2 INITIALLY CONTINUED TO ROLLBACK THEN ADVANCED AND SEEMED TO OPERATE NORMALLY AIRSPEED INCREASED TO ABOUT 230 KIAS ONCE NR 2 CAME BACK. CMC SHOWED AT SPLIT MSG 22310078TA2. PERFORMED FIM TASK 22-31-00-810-922-A. NO FAULTS FOUND. PERFORMED TASK OF THE TCQ LEVERS PER THE AMM 22-31-00-710-801-A/500, AUTO TEST NORMAL. PER MCC /ENGINEERING TSI ISSUED REPLACED FADEC NR 2. REMOVED AND REPLACED FADEC NR 2 PER TSI 2159 AMM 73-00-00. PERFORMED OPS CHECK PER AMM 72-00-00. ALL CHECKS NORMAL.