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1) Prior to removing the paneling, the circuit breaker that controls the receptacle should have been turned OFF to prevent any potential safety issues.
2) Turn the breaker to the OFF position and perform a visual inspection of the conductors. More than likely there is a loose termination or a wire splice came loose that caused the receptacle to arc and pop. Depending upon the conductor and/or receptacle damage, these may or may not be able to be re-used.
3) Send me a picture of the receptacle and wires so I can review and see what kind of damage occurred.