I have a 1984 Hatteras MY . The shore power failed. The main breaker would trip as soon as switched on. We switched off all 3 load panels and still tripped as if there was an overload immediately ! So as there was no load (all sub panels off) I figured must be a bad breaker. I replaced the breaker. Same thing. Then I remembered these boat have transformers. The shore power and all systems work fine on source 2 which uses the other transformer. My question is has anyone had the experience of a transformer failing ? And if so was the solution to replace or eliminate or replace with some more modern system ?