baghloli

Good afternoon everyone,
I own year 2000 lx470 and it has been running fairly good since I purchased it about 3 years ago.
Recently I started to find water droplets dropping from the dome light button as well as the area above the driver side footrest. (drops fall on my left foot when I drive). I didnt pay much attention
But last week, it suddenly started to discharge a lot of water withing the car and it appeared to cause some damage.
1) I notice a lot of standing water around the sunroof. I found there are two small opening on either side of the sunroof area which I think are for discharging rain water but it looks like these are blocked. How can I open it?
2) The car suddenly started to beep continouslly while driving in rain. It looks like the horn is somehow shortcircuit because of the water. I unplug the cable which is attached with the horn in front(there was smoke coming out of the right side horn when I unplug it but it was still beeping). But now, the horn does not work after I plugin the cable. Do you think that the electricity might have burned cable connecting with the horn (or a fuse, or something else). The left side horn does not beep either. What is the use of that horn?d
3) The dashboard lights suddenly became dimm. Now, these are no longer bright. What do you think is this problem? Water has burned something but I couldnt find what it might be.

Many thanks for reading and your timely suggestions