My 9 year old hot tub needs topping off weekly and there's evidence of a leak between the tub frame and the concrete slab. The hot tub was built-in with an Ipe hardwood deck using "biscuit-type" fastners for a clean deck look. My local spa dealer where I bought the hot tub wants to use a crane to lift the empty hot tub for repairs. Are there any ideas for locating/repairing this leak that may be simpler (also less expensive)?