If it's a huge pain and nothing works out I've got a WLtoys ESC/reciever from a 144001 that worked fine and I don't use that's the same in your rig. You cover shipping and $5 and it's yours, I'll also toss in a replacement servo in case yours fails you'd have an extra?
First I'd check your manuel if there's a way to reset your ESC/reciever. Then I'd start with setting your trim knob dead center turn truck on. Then try all the way right then turn truck on, make sure you have it off the ground in case it takes off. Check all your wires/connections from the motor...