Why are the fuses on the car amplifier blowing?

Question

Electronics

The fuses on the subwoofer amplifier are blown.
It began with the fact that, out of my stupidity, I put a 30 A fuse (it was necessary for 15 A). The amp played, but smoked. The fuse remained intact. I took it apart and saw that the transistor burned out. Soldered a new one, the amp played a little more and stopped. The fuses started blowing. I took it apart, I saw that the resistor on the neighboring similar transistor burned out, which in the end was also replaced with a new one. Both transistors go to the distributor. In general, the entire board is intact, in some places on some resistors there may be a slight deposit / dirt.
When you install a fuse, it instantly melts and burns with the wildest sparks.
Photos are attached. Thanks in advance.

1. This transistor burned out and was replaced.
   
2. This one was replaced later. Just in case. Outwardly, he was alive.
   
3. This resistor burned out and was replaced.
   

Answer 1

Look for a short circuit. Check all other output transistors, since one burned out (at least on a short circuit between the drain and the source). Look at R517, it's kind of smoky. Check with disabled columns. You can check each column for a short circuit with a multimeter, two wires and each on the case.