Try that :) works great for me.

[aircraft]
nosegear = 20.84
refueling = 1
battery = 1
pushbackraise = 1
pushbackdummyevent = 0
pushbackcheckengines = 0
iscargo = 1
trafficcones = 1
preferredexit =  0
wingrootpos = 3.38 1.78 -0.17
wingtippos = 23.02 -8.41 1.53
fuelpos = -14.75 -2.50 0.53
waterpos = 0.00 0.00 0.00
lavatorypos = 0.00 0.00 0.00
gpupos = 0.00 0.00 0.00
engine1pos = -7.92 4.27 -1.83
engine2pos = 7.92 4.27 -1.83
engine3pos = 0.00 0.00 0.00
engine4pos = 0.00 0.00 0.00

[exit1]
pos = -2.38 19.98 -0.00 5.80
code = (L:ext757_door1_l, bool)
name = 1L
embeddedStair = 0

[exit2]
remove = 1

[exit3]
remove = 1

[exit4]
remove = 1

[service1]
pos = 2.41 19.95 0.03 -6.40
code = (L:ext757_door1_r, bool)
name = 1R
embeddedStair = 0

[service2]
pos = 2.40 -17.69 0.03 5.50
code = (L:ext757_door3_r, bool)
name = 4R
embeddedStair = 0

[cargo1]
pos = 1.31 14.06 -1.77 0.00
code = (L:ext757_door_cargo_1, bool)
name = Cargo Door FWD
embeddedStair = 0
uldcode = AKC,AKE,DPE

[cargo2]
pos = 1.25 -12.60 -1.77 0.00
code = (L:ext757_door_cargo_2, bool)
name = Cargo Door AFT
embeddedStair = 0
uldcode = AKC,AKE,DPE

[cargomain]
remove = 1