Problems with Pro-Upgarde on a D400

[Axel]

After a waiting period of over three weeks, both devices are back yesterday.

The Companion's mounting bracket is still loose, but at least the power supply is silent.
Now I hope that everything stays like this and that there will be no further failure.

atb, Tom

Did you try gently pulling apart the two prongs that the cover fits over? It worked for me.