Cal Club Autocross Forums

My Bolt EV has a very slow AC leak my dealership can't seem to find even after they put dye in it two years ago. Can anybody recommend an independent shop that might be better at finding this? I'm in El Sereno, near Highland Park, Alhambra, South Pasadena.
It's an R-1234YF system, and I've read the off-the-shelf leak sealant stuff could hurt the compressor or seal in moisture.
Thanks.