Need help with iPhone board swap projects

Hi, I own a small phone repair shop in San Jose, California and I'm getting more and more customers bringing me phones with a dead motherboard that I cannot repair on my own and need help getting the customer's data recovered. Is there anyone in United States (preferably from California) who could help me with motherboard swap projects? I've been trying to find a reliable shop who does this with no luck so far; please contact me with suggestions, I would really appreciate it!