What was found
T/O WARN SYS DOES NOT ACTIVATE UPON ADVANCEMENT OF NR 1 THRUST LEVER- NORMAL OPS W/NR 2 THRUST LEVER- ADDITIONAL INFO; SOMETIMES NR 1 LEVER ACTIVATES T/O WARNING BUT USUALLY NOT. ACFT GROUNDED. SUSPECT M1766 LT A/T SWITCH PACK ASSY. REPLACED LT A/T SWITCHPACK ASSY IAW MM 76-11-07, INSTALLED B/P PN 254A1150-9, S/N AA-079. RECEIVED IN SERVICEABLE CONDITION W/SERVICEABLE TAG. GROUND VERIFICATION SUCCESSFUL. OPS TESTS & PRESSURIZATION GOOD IAW 76-11-07, NO LONGER A BORROWED PART, THIS CLEARS BORROWED PART DEFERRAL.