This will be EWS 3 which does control the terminal 50 circuit. 2 Heavy black wires on terminals 1 and 3 I think. EWS module located above drivers right knee.
Off the top of my head I would have said there was no starter relay except in the EWS module but I could well be wrong there.
Matt, if you still need info on the wiring post up some more detail and I will sort you out. Which supply is missing from which relay? VIN?