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$VAR1->{ETPT}

$VAR1->{ETPT}{SERVER}

$VAR1->{ETPT}{SERVER}[0]{RESPONSE}    # First element of the array
$VAR1->{ETPT}{SERVER}[1]{RESPONSE}    # Second element of the array

for (@{$VAR1->{ETPT}{SERVER}}) {
   # here $_->{RESPONSE} is each response of the array
}