My MDX has started to blow the horn/brake light fuse. By doing so it's also sending the car into ABS/VSA faults. I disconnected the passenger side horn, replaced the fuse and the other horn worked. I reset the lights and drove it for a day. I went to test the horn and no sound. Then about 5 minutes later all the ABS/VSA lights lit up again. I've read that it could be the multiplex/interior fuse box being faulty. Is there anything else before I do that big job?