If you have power/ground at the outstation, then it's probably one of the serial link wires between the BECM and door outstation which has failed. I've seen it numerous times.
Check the continuity on the Light Green, Red, and Orange/Green wires from the door outstation connector to the BECM. They appear on the 16 way Blue connector on the front edge of the BECM.
Light Green is pin 13 on BECM connector
Red is pin 14 on BECM connector
Orange/Green is on pin 15 of BECM connector.
If any of these is broken then it will stop all communication with the door outstation, and you'll have a dead door.
First place to check if one is faulty is the connectors inside the bodywork of the A pillar. Pull the rubber cable sheath out from the vehicle side with the door open, and you should be able to pull the connectors through the hole in the bodywork (they are fiddly) and check them for any sign of corrosion/broken pins on the above mentioned wires.
If they are OK, pop the plastic sill trim and inspect the wiring looms in there, as I've found corroded wires with a break in them in the looms before, including one with that exact problem where the door had stopped. I ended up chopping out the broken section of wire and soldering/heatshrink a new length of wire into the loom.
Sorry I haven't seen this earlier - I'm still out of the UK (currently in NZ, but been touring the US earlier in the year) and not on forums/FB groups/email much anymore as life has been too busy - and all my p38 stuff is in the UK still currently...