You say the fuse blew when changing the interior bulb. Is the new bulb either defective or blowing fuses if inserted incorrectly. You really need a test meter so you can measure the voltage on the little pips on top of the fuse to see if the fuse is blown. It has been known for some cheap LED bulbs to blow fuses, so I would take the bulb out and leave it out, and then see what else still fails, as the interior light symptom could be a red herring.
In the past I blew a fuse plugging a dodgy plug into cig lighter socket, and automatically plugged the same plug into another socket and blew that fuse as well, so it's easy to get side-tracked/distracted by a false symptom.
A fuse is there to protect a circuit, wires, switches , as well as bulbs, so your first job is to prove the fuse is blowing.
A bit long winded, sorry, but I hope this might help.