Ingersoll Rand Model SS4 will not shut off while running,

Our shop air compressor, An Ingersoll Rand Model SS4 we got from Tractor Supply in 2013 would not stop running when it hit 125 psi but continued to run and started making a sputtering, popping noise.

We shut off the power to it immediately, it was at 150 psi when we shut it down.

We then bled off the tank pressure to 50 psi.

If this is something simple, like a switch or seal we would like to repair it ourselves.

Do you have any ideas where we should start? Thank you

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