In your code this:
if (!defined $first_record) {
$first_record = $line;
seems really dangerous as you can't say for certain the contents of $line. Could be a null, a lone line terminator or whatever the last thing was you wrote to the socket. I know you may have convinced yourself there are only valid records but the validation checks need to be done in code and not in the head. Put the validation checks in the code elsewise you're just guessing.
s//----->\t/;$~="JAPH";s//\r<$~~/;{s|~$~-|-~$~|||s
|-$~~|$~~-|||s,<$~~,<~$~,,s,~$~>,$~~>,,
$|=1,select$,,$,,$,,1e-1;print;redo}
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