How do you replace the circotherm fan + motor on a Neff B1430 built-inoven?

I have taken the vent/safety panel at back of oven to expose the circular heating element which surrounds the fan. I then dismounted the fan only to find that the motor is housed behind yet another panel which is the full width of the oven. Although I've unscrewed the remaining holding screws, the panel won't move. Is access to the motor from the opening of this panel? Can't possibly from the back of the oven can it?