Random shut down

[robert3rekab]

Got the (reman) ecm from International ($2,700+$189 for them to program)
Truck started right up but there are some issues.... The abs light on dash has gone away (good, I hope?), The traction control light is still on along with the triangle light.... But now there is a new red light flashing continuously that says "engine brake" and my console switch for the "PdL" does not light up green when I activate it.
Is this new ECM simply going to need some reprogramming? I'm waiting to hear back from international for what their verdict is going to be on this, but thought it would be good to first check with you guys here since you've helped me so much already. Thank you!