I got called to a fault a few weeks back on a PUHZ P125VHA. I found the breaker tripped and no power to the condensor.
After a few checks i found continuity between live and neutral on the power board with mains power and interconnecting disconnected. I checked the compressor and got readings of 0.5 kohms from u-v, v-w, and u-w.

I spoke to Mitsubishi who advised me to not only change the power board but also the actm, rush resister and noise filter.
Another guy went back and fitted them and he said it was running fine and he recomissioned it.
However when i have gone back today to carry out maintenance, i've found the unit off and upon furthur inspection found the same problem....continuity between live and neutral.
I tried to follow the electronics but they confuse me, even the spark was lost, has anyone come across this before?