Hi Hayleigh,
These can be found in the following location:
<ArcGISServerContentDrive>\arcgisserver\directories\arcgissystem\arcgisinput\<nameOfService>\v101
Please be mindful that this file is modified by ArcGIS Server when publishing/republishing. The ArcGIS Pro project/Desktop Mapping document is copied to this location when publishing (along with a service definition).
Don't open the file from this location as it prevents any republishing (with a file lock), I found out the hardway 🙂 Copy it to another location to inspect!
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