all i did was add a time stamp? but on a serious note you could have a defective coil which slowly died versus say something as catastrophic as the wrench melting in seconds. tinsel lead could have come in contact with something it shouldn't.
As for your fuse question it is wired in parallel (correct if i am wrong here folks) so your fuses blew in order of weakest to strongest in an attempt to protect your amp and by the 3 fuse it was making a racket as you could tell. I would check ground first remember to disconnect the rca's before you disconnect the ground, i would check the resistance of your speakers, then inspect your wires, and finally try a different input source.
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