What was found
DURING CRUISE ATFL230 THE NR 2 ENGINE ROLLED BACK TO IDLE. TURNED OFF AUTO PILOT & AUTOTHROTTLE. NR 2 ENGINE PARAMETERS WERE LOW BUT NORMAL FOR IDLE. NR 2 THROTTLE HAD NO RESPONSE AT ALL RAN QRH & LANDED FLAPS 15. EMERGANCY DECLARED. TAXI TO GATE WAS NORMAL. DURING TROUBLESHOOTING FOUND THE ENTIRE A CHANNEL OF NR 2 EEC FAILED. ALSO FOUND CH B TRA SIGNAL INOP CAUSING A COMPLETE LOSS OF THRUST RESOLVER ANGLE ON NR 2 ENGINE. FOUND CONNECTOR DP0460 LOOSE CAUSING A LOSS OF CH B SINE SIGNAL. RESECURED CONNECTOR DP0460 & REMOVED & REPLACED THE NR 2 EEC IAW AMM 73-21-06 & 73-21-60. PERFORMED HIGH POWER ENGINE RUN IAW AMM 71-00-00 OPS CHECKS GOOD.