Thanks FixMe. As my saga goes, picked up my car from service yesterday and then returned it 5 min later. While the GPS issue was resolved (with addition of Gyro board), my LTE was malfunctioning, switching into 3G. Now again ready for pickup, after installation of a new "connectivity board" (by which I guess they mean the LTE card.)
So now after my 5th visit to service (two separate attempts at software fixes to my MCU issues, third for install of a recon MCU1, fourth to install missing gyro board, and fifth to replace faulty LTE card that was in the recon MCU)... I HOPE everything is good now!
The guys at the service center are very nice, but clearly the overall quality of service had dropped from prior years, at least in my experience.
"Your mileage may vary.". I hope it does!