As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CRUISE ALTITUDE 43000', NR 2 ENGINE BEGAN TO SLOWLY LOSE POWER. POWER DECLINED TO APPROX 50 PERCENT. PRECAUTIONARY LANDING. AT LOWER ALTITUDES THROTTLE HAD LITTLE EFFECT CONTROLLING ENGINE. ENGINE WOULD NOT ACCELERATE ABOVE FLT IDLE REGARDLESS OF THROTTLE POSITION. AFTER TROUBLESHOOTING, FOUND RT ENGINE "B" FADEC FAILED, R & R UNIT IAW MM 76-10-05, GROUND RAN RT ENGINE, "B" FADEC TESTED GOOD IAW MM 72-00-00 & 73-20-01.