Dacor oven error codes

Replaced cooling fan after getting error code "U60 cooling fan". Reset error codes. Oven seemed to start working, but soon made continuous clicking noise, then shut down. Now I’m getting error codes: "U60 cooling fan", "U43 Relay Board", and "C74 Comm Error". I’m guessing the cooling fan was never the real problem in the first place. Will replacing the relay board likely fix my problem? If not, what is my next step?