Latest update. Had the car in at the dealership again yesterday. Asst. Service Mgr. called w/ questions about how I determined the coolant leak. Told him I smell coolant after vigorious acceleration and the leak is most likely at the EGR Cooler. He says they will pull the EGR cooler and inspect. Told him it would probably take about 3 hrs. and as it was now 2:30pm, they would never finish before closing. I offered to e-mail him a copy of the complete M6 recall packet, including removal/repair instructions, with diagrams. Less than 1/2 hour later, he calls and says the job is more like 4 hrs. Based on my symptoms, they are ordering a EGR Cooler kit replacement even though my car is outside the VIN numbers specified in the recall.
Now have to wait 1-2 weeks for the new parts.