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This could be it here... now that I looked at this pic a little harder. Typically, the metal modules that I've messed with have two connectors and that box looks like it only has one. If you can remove or move that vent up a little, you should be able to see a white sticker on top.... might have an arrow or a pretty large letter on top.
I would strongly suggest you completely unhook and discharge your system if you plan on removing the module. Are you replacing it, or what are you needing to do?