hope this helps
As far the horns, your probably right, you need new ones, if you can't find any other problems. The horns are probably blown.
Second with the fluid pump, check to see if you can here the pump working, if you do, then pump is fine and your hoses leading to the squirters are clogged.
If all else is clear and the no pump noise, then you most likely need a new pump.
The last two, i couldn't help you, but for everything, i would find a reputable technician and have them take a look. As far as the locks and flashers go, it might be a cheap part however just labor intensive. But any mechanic would give you a quote that you can approve before they do the work.
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