PJL commands are standard parts of the job header of most print jobs, and would normally be executed, rather than being treated as text and printed.
The fact that this command is being printed implies that the job header is incorrect or has been corrupted.
The print job should start with a Universal Exit Language escape sequence, to cause the printer to transfer control to the PJL interpreter.
Capture ('print to file') of a sample print job, and analysis of the resultant capture file, should confirm whether or not the generated job header is syntactically valid; if it appears to be valid, the implication is that the job is being corrupted (somehow) between workstation and printer.
If the job header is incorrect, this implies a driver fault.
I have no knowledge of AIX, so I've no idea how to perform any 'capture' of a print job, nor what the equivalent of a Windows printer driver would be.
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