[villagetinker]

OP, if your spa is below grade in a concrete pit, you will NOT need to bust up the concrete, you will however need to have the spa completely drained, and then raised out of the pit. Once this is done the side can be removed and hopefully the leak repaired. IMHO, I would contact the manufacturer, and see if they have a procedure for fixing this type of leak once the water has been drained (before removal) as this would easily be the lowest cost. Without actually seeing your spa, I cannot make any suggestions for possible repairs. Finally, if your spa is several years old (over 10?) it might be better to get a new one. Also, I suggested this on another thread, you can put some food coloring in the spa water, and you might be able to see exactly where the water is leaking, this may help with the repair.