It's unusual that you've lost power to both 12 V and 24 receptacles. I agree that the 12 V runs off the Sailor 24->12 V transformers. The 24 V should be on the circuit that is on your 24 V panel; there is a breaker labeled "24V", in the lower left as I recall. However, Amel did change the 220 and 24 V panels over the years.