I am almost certain the CS 757 model has a few lights that are embedded into the model that can not be modified by the aircraft.cfg.
Nonetheless, here is my setup if you want to try.

[LIGHTS]
//Types: 1=beacon, 2=strobe, 3=navigation, 4=cockpit, 5=landing  
light.0 = 1, 0.70, 0.00, -3.90,fx_beaconh
light.1 = 2, -79.00, 0.30, 5.50, fx_shockwave_navred//on tail wing
light.2 = 2, -79.00, 0.30, 7.00, fx_shockwave_strobe_sm_3//on tail wing
light.3 = 4, 67.00, 2.00, 5.19, fx_shockwave_vclight_l
light.4 = 4, 67.00, -2.00, 5.19, fx_shockwave_vclight_l
light.5 = 5, 15.35, 7.35, 0.10, Fx_shockwave_landing_light_small_xenon
light.6 = 5, 15.35, -7.35, 0.10, Fx_shockwave_landing_light_small_xenon
light.7= 6, 57.80, 0.7, -4.34, fx_shockwave_landing_light_narrow_down
light.8= 6, 57.80, -0.7, -4.34, fx_shockwave_landing_light_narrow_down
light.9= 5, 57.80, 0.0, -5.60, Fx_shockwave_landing_light_small_xenon // to be independent of the gear-switch delete this entry !
light.10= 2, -22.00, -62.00, 6.00, fx_shockwave_strobe_2_nl
light.12= 2, -22.00, 62.00, 6.00, fx_shockwave_strobe_2_nl
light.13 = 7, -17.00, -47.00,  2.50, cs757_sf
light.14= 7, -17.00,  47.00,  2.50, cs757_sf
light.15= 1,  1, 40.00, 0.30, 10.57,fx_beaconh
//light.1 = 2, -79.00, 0.30, 5.50, fx_shockwave_navwhi
//light.1 = 2, -79.00, 0.30, 5.50, fx_shockwave_navred
//light.1 = 2, -79.00, 0.30, 5.50, fx_shockwave_navyellow
//light.1 = 2, -79.00, 0.30, 5.50, fx_shockwave_navgre