After seeing several posts on liver problems in corgis , I wanted to mention Copper Liver Disease . We learned more about this disease than we ever wanted to know last spring when my Izzy suddenly was diagnosed. Many breeds are effected by this primarily Bedlington terriers but also corgis. It can be treated if diagnosed early enough. Unfortunately in our case we were too late. If you are seeing elevated liver enzymes, mention this disease to your vet.
Best of luck to those of you going through this.