Hi Ken;
I don't think there is any 'general' answer your question: only local ones. It doesn't really matter what someone, somewhere, can do . . . if no one in YOUR area can do it. Leak detection is tricky, and requires good tech AND good skills, along with a fair amount of luck.
You might try looking up the phone of the SCP (South Central Pool) wholesaler in your area, call them, and ask who does leak detection in YOUR area. That's really the only relevant answer.
Good luck.
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