+1 on the spare DME relay. It's under the drivers seat and bolted down at the tab so not exactly easy to get at. Give it a tap and try again. If you are handy with a soldering iron remove it and resolder the connections inside.
Something I always carry for my 968 and 911 is a DME bypass jumper. This will bypass the relay and permanently run your pump for testing. If you have no spare this will prove out the dead relay.