Is there a fix database out there that's accessible to the general public?

Have a problem one of the CFIIs and I are trying to solve. There is a fix that has an MRA of +2000ft from the route altitude which would seem to indicate its defined by an off route navaid but doesn't specify the navaid and seems to only be indicated by DME from the navaid that the route is defined by. So I'm wondering if there is an accessible database somewhere that shows what defines the fix since the low en route isn't making a whole lotta sense.