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portable pa hack gone wrong!

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The silk screen labeling suggests that the power amplifier is being supplied ±15V and there's a label for -7.5V.
 
Notice, the red leds indicate mute, sub limit, and top limit! Don't know if this information will help give me an idea about what I destroyed!
The bottom right side of the board
20180403_195552.jpg
is the spot where the negative speaker wire touched the small heat sink for the voltage regulators.
 
Wouldnt i still need a buck converter to get my ebike battery from 48v to 15v?.....also, i would need some type of regulator to keep the voltage to the board constant, no?
Would you suggest taking out the 2 voltage regulators and the amplifier IC to test them or, should I wait until I get the replacement?
 
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What are the numbers on the parts you're calling voltage regulators?

I'm also seeing another silkscreen marking of +54V. It would be nice if I could see everything.
 
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Those are linear regulators for ±15V. They may have used a switcher to develop 54V then fed that to the linears but I can't tell without seeing everything and making a few measurements. That -7.5V tag still has me curious of course.
 
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Those are linear regulators for ±15V. They may have used a switcher to develop 54V then fed that to the linears but I can't tell without seeing evdrything and making a few measurements. That -7.5V tag still has me curious of course.
Here is a pic....
20180401_114416-1494x2656.jpg
 
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