Dehler may be the best people to talk to as this may have happened to your model in the past.
Has the mast moved either forwards or backwards due to overzealous tensioning of the forestay or backstay? Is there any flexing of the bulkhead or a 'creaking' noise from the bulkhead on a windward beat?
Ok, from what I can see in the photos, you have to take the mast down, remove the tabernacle & headlining and find out what has moved. You will then need to reinforce the decking and possibly the footing or integrity of the bulkhead.
This would be done by a mixture of epoxy and something akin to a group of chainplates to the tabernacle.
I am glad you noticed this when you are tied up to a marina, not in the middle of the atlantic.
Step by step and good luck. Please post your progress (with pics)
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