Update: Car is fixed. Had it towed to dealer this a.m. Turns out it was the RDAR (Remote Digital Audio Receiver) software. The software controls the satellite radio receiver and was draining the battery even when the car is off. Apparently a known problem that has resulted in a class action lawsuit against Volvo. I had to get a software upgrade and a new battery, but thankful it wasn’t the CEM. Am disappointed in Volvo though since this is apparently a known issue and yet they still charge for the software upgrade.