What was found
DISC - AFTER LANDING GOT E1-2 NO DISP + RUD HDOV PROT FAIL. ALSO EN ROUTE FELT LEFT YAW. LOOKED AT ENG INSTRUMENTS AND SAW SOME FLUCTUATION. LATER, YAW AGAIN + LOST NR 1 ITT (AGAIN) AOM NR 1 PROCEDURE BROUGHT IT BACK. SAW N1 GO TO 68 PERCENT + ING AB + LOW FUEL FLOW. LATER SAW N1 GO TO 58 PERCENT, FUEL FLOW TO 220ILBS + ING AB. FLIGHT ATTENDANT IN THE LOOP AT THIS POINT REPORTED, HEARD THE MOTORS SOUNDED LIKE THEY SPOOLED BACK AND FORTH RATHER QUICKLY, ALL OTHER TIMES ENGINE INDICATIONS WERE NORMAL. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED NR 1 ENGINE FADEC 1A IAW EMB-145 AMM 73-22-01. OPERATIONAL TEST GOOD. AIRCRAFT RETURNED TO SERVICE.