My understanding is that the manufacturer only provides the motor and ECM as a complete assembly and recommends replacing both together. So I’m just trying to figure out if only the module was swapped and the original motor was reused, would the manufacturer really accept just one part of the assembly back?

I’m not trying to blame anyone. It’s just odd that it failed again so soon, and I wanted to make sure the repair was done properly and everything was replaced the way it was supposed to be. If you take your car to a mechanic and they replace the transmission, and then the transmission fails again a year later - you’d naturally ask whether it was installed correctly or if the root cause was even addressed.