What was found
NR 4 ENGINE HAD NO THRUST LEVER RESPONSE WHEN AIRCRAFT READY FOR TAKEOFF. CHECKED ENGINE CONTROL LINKAGE, ALL CHECKED GOOD. CHECKED PS4 LINE CHECKS GOOD. CHECKED PT2 SENSOR AND LINE CHECKED GOOD. APPLIED HEAT PER MAINTENANCE MANUAL 71-00-00 PAGE 262, RAN ENGINE AND LEAK CHECK AND RUN UP ALL CHECKED GOOD PER MAINTENANCE MANUAL 71-00-00. SUSPECT DE-ICING FLUID GOT INTO PT2 SENSOR.