MLC errors.

Contributed by Eric Westzaan.

MLC-error 7931

We suffered from an MLC-error 7931 during IMRT treatment. The problem was intermittent.

The problem was solved by removing all the white MLC-connectors in the radiation head in combination with changing a DMUX board.
Changing the DMUX or removing the connectors only wasn't enough. Only the combination proved to be successful.