My 2013 P85 is in the SC now for several issues. All were to be resolved today except the MCU replacement. I spoke with my SC and they used the position that my car is in their custody as leverage to get a replacement MCU quicker (LT went from 10 days to 1 day). No promises on availability for anyone else, and maybe I got lucky, but it seems to be a good strategy with the SC. Take the car in, get the attention. Schedule on the App and have your can kicked down the road.
Replacement Parts:
MCU,MDLX,NA PREMIUM,REMAN(1098010-99-H) *This has LTE vs. the original 3G connectivity
ANTENNA , BLUETOOTH(1052393-00-B)
Rear View Camera HSD Jumper(1127304-00-B)
Good luck.