Water Ingress in Lunar 462

Just had my first service on a 2nd hand 2013 Lunar Quasar 462 i bought 2 years ago. Told I have 100% moisture levels at the front right offside seam. Smallish dark patch showing on the inside. All other areas in the caravan are fine.  Just wondered in anyone can recommend a reliable repairer as the service agent didnt seem interested. I assume its going to cost me a packet. I live in Weston Super Mare (North Somerset).

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