1996 Pete 379 N14 Engine Brake

Working on a 1996 379 Peterbilt with the Cummins N14 with Celect ECM. Engine brake is inop. I'm looking for wiring schematic to figure out location of the OEM engine brake relay. I have access to cummins QuickServe Online, so I got the engine side covered. Hoping someone has a Peterbilt schematic that will help me out. Truck is beat, relay box in cab has no cover and nothing's labeled. Thanks

1996 Pete 379 N14 Engine Brake