Parasitic battery drain with engine off and on

I’m trying to find a parasitic short which completely drains the battery within a few hours. This car had a leak under the dash on passenger side and soaked the fuse panel as well as the computer underneath it. The owner told me that his radio wouldn’t shut off and numerous other electrical problems as well. He just purchased this car and before I took a look I told him it could possibly be the ignition switch. The short is catastrophe to all the new batteries he’s put in the car. They will not last one evening just sitting in the parking lot. I took apart the fuse box and removed the once to clean all fuses and terminals. I’m most likely going to have to replace the relays as well. I cannot find a wiring diagram which would expedite this whole mess. I have all the diagnostic tools and meters necessary as I used to work on cars for a living. I know there’s no way you could diagnose this electrical problem without seeing the components that were affected. I would like to know where or who carries the wiring diagrams for this car listed above, convertible ,base line trim and features. Thanks for any on-site you could provide me to get this mess underway. I don’t even know if the computer is salvageable or the fuse panel as well.