You need a good boat shop that has someone that has experience with trim tabs. I know a guy in Phoenix that is pretty good. Turns out I had a cable that broke, most likely when someone stepped on the K-planes to get into the boat.
Good luck. There is a good boat shop off the I-5 south of Castaic. I want top say get off at Lyons Avenue and go east. But not sure. It's in that area. Guys pretty knowledgeable. Shop is not that impressive but does good work and is reasonable. Two Australian guys if I remember right.
Hope that helps.