Lunar champ floor

Hi, 

Our 2004 lunar champ passed its mot today,

The mot tester pointed out that there are some of the edges of the floor from the underside (plywood) is wet and rotten.(but does not affect the outcome of the mot).

I am quite handy at joinery , but mostly in properties and not sure how difficult it can be to have a go myself ????

Please can anyone recommend a decent repair company local to me in Deeside, north wales.

We do have a main caravan dealership close by but I would have to rob a bank to pay for their repair costs.🤣

Thanks in advance 

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