What was found
NR 2 ENGINE XB ILLUMINATED DURING CLIMB & DESCENT. ACFT GROUNDED. ACCOMPLISHED TROUBLESHOOTING FOR THE NR 2 ENGINE XB INDICATION IAW FIM 76-05 TASK 809. FAULT ISOLATION SHOWED THE NR 2 ENGINE START LEVER CHANNEL A INPUTS TO DEU-1 AND DEU-2 SHOWED CUTOFF WITH LEVER IN IDLE POSITION. THE NR 2 ENGINE EEC BITE SHOWED FAULT 76-31362 THE START LEVER SIGNALS DISAGREE LOGGED FOR SIX OUT OF TEN STARTS. ACCOMPLISHED TROUBLESHOOTING FOR FAULT 76-31362 IAW FIM 76-11, TASK 801, VERIFIED START LEVER INPUTS TO R568 START LEVER RELAY WERE OUT OF LIMITS. REMOVED AND REPLACED M1825 ENGINE START BRAKE ASSY IAW AMM 76-11-10-010-801-F00, AND 76-11-10-420-801-F00. PERFORMED ENGINE FUEL SPAR VALVE ELECTRICAL CONTROL AND INDICATION TEST IAW AMM 28-22-00-710-801, EEC TEST IAW AMM 73-21-00-700-804-F00, EEC DISCRETES TEST IAW AMM 73-21-00-700-809-F00, ENGINE IGNITION SYSTEM AUDIBLE TEST IAW AMM 74-00-00-750-801-F00, AND POWERPLANT TEST NR 13 ENGINE RUN - EEC BITE CHECK IAW AMM 71-00-00-700-808-F00 - ALL TESTS PASSED.