It's probably not just a question of replacing a fuse.
They need to clean out whatever was spilled. Not cleaning that mess would mean LOT of corosion that could totaly destroy the radio, sat-nav unit and some cabling and connectors. The spill couls also have reatched some other components that also need cleaning and drying.
Next, they need to thouroughly dry everything out.
It's possible that some component need to be replaced.
Electro, June 2013