My 2004 XJ8's trunk filled with water recently. That's fixed, but I have no audio system now. The likely culprit is the fuse holder in the trunk, but a cursory inspection didn't reveal how the connections on the bottom of the fuse box are secured. Might there be a screw that secures each connector to the bottom of the fuse box? I saw no latches, plastic tabs, etc. but I remember seeing a rubber 'plug' on each connector, but it didn't register at the time.

Any first-hand knowledge?