What was found
ADVANCING NR 1 ENGINE THROTTLE DOES NOT CAUSE TAKEOFF WARNING HORN AND TAKEOFF CONFIGURATION LIGHT TO ILLUMINATE. PROBLEM IS INTERMITTENT. ACFT GROUNDED. PSEU BITE IAW FIM 32-09 TASK 801 SHOWED NO EXISTING FAULTS BUT FAULT HISTORY SHOWED FAULT 31-52002 TRA LT 53 FAULT LOGGED FOR MULTIPLE FLIGHT LEGS. PERFORMED TROUBLESHOOTING FOR FAULT 31-52002 IAW FIM 32-09 TASK 815 - LEFT AUTOTHROTTLE SWITCHPACK (M1766) SWITCH S8 FAILED TEST. REMOVED AND REPLACED M1766 A/T SWITCHPACK IAW AMM 76-11-07-020-802-F00, & AMM 76-11-07-400-802-F00. PERFORMED SWITCH CHECK AND ADJUSTMENT IAW AMM 76-11-07-820-801-F00, OPS NORMAL. PERFORMED ENGINE THROTTLE SWITCH (S1) FUNCTIONAL TEST IAW AMM 27-62-00-720-801, AUTOTHROTTLE SWITCHPACK TEST IAW AMM 31-51-00-741-804, ANTISKID/AUTOBRAKE CONTROL UNIT OPERATIONAL TEST IAW AMM 32-42-00-720-801, THRUST REVERSER NORMAL OPERATION TEST IAW AMM 78-31-00-700-801-F00, PROXIMITY SWITCH ELECTRONICS UNIT (PSEU) OPERATIONAL TEST IAW AMM 32-09-10-710-801, WING ANTI-ICE OPERATIONAL TEST IAW AMM 30-11-00-710-801, AND WEATHER RADAR SYSTEM, OPERATIONAL TEST IAW AMM 34-43-00-710-802-001. ALL TESTS PASSED.