Yes, you can test the stator windings at the 3-phase HV wiring at the center of the gearcase, under that orange cover with the "do not disturb" iconography. For others (sorry for the poor lighting; these are found images, not mine):

My experience on mine was that testing could be accomplished ...

Why are you certain that it's the LDU whose resistance is changing?
...
Do you disconnect the LDU's HV cables and test the iso resistance of the LDU itself?



All good points. I have ruled out all other HV components through various means (primarily direct measurements using an isolation tester ...

Hi there,

I've owned a 2014 P85D since 2019 that recently had coolant ingress at around 70k miles.

LDU P/N: 1025598-00-P
LDU S/N: T13E0015996 R2

About a year ago, I used the Ceimin yellow triple lip seal - 30x55x8 apparently renamed to OD55 CTLBDYW-3965 and this 6007-2RZTN9/HC5C3WT SKF bearing ...