Welcome to friends. Lots of info here on everything transplant, for example, there's a group here named Transplant No-No's where members from all over the world tell what their centers warned them about.
You might also want to look into Transplantbuddies.org which has forums on all topics. Yes, diets, but just about anything else. And, I think that we have more kidney members than for any other solid organ.
BTW, here's a nice booklet on food safety for transplant recipients from the US Department of Agriculture: