UKMIL Nimrod MR2

I'm probably missing something very simple, but I can't get the weapons bay doors to close. Can anyone advise?
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The HS801, MR1 and MR2 models are fitted with working Bomb Doors, Some models are fitted with Stores within the Bomb Bay.
The Doors can be opened by selecting the Water Rudder Command.
This will have to be assigned by yourself.
So please follow the relevant documentation appropriate to your version of Flight Simulator on instructions on how to assign key commands.