Panasonic NA-140VS4 Steam injection pipe issue?

[Downunder]

I have just purchased the above (used) model which the seller said needed the drum bearing/s replacing. I noticed when I split the drum housing that the inner stainless rim where the 5x water jets and stem inlet is, was caked in gunge. I removed the trim, and it was just one huge mess. On cleaning it (never done one before), i noticed that where the pipe comes in (steam), there was a "tee" connection just inside the drum housing, with the left hand side going into the small steam jet injector (multi-hole), but the right hand side of the "tee" is just open with just the bare barb of the plastic "tee" and not even any pipe attached. There is obviously something missing here, and I have no idea what that might be! There seems to be a small scar on the plastic surround insert (which the pipe etc clips to) just about an inch from the end of the "tee" branch, and I'm wondering if there was a plastic protrusion/dowel or something, which may have held some connection (what was on the right hand branch of the "tee"?), or whether it should be simply plugged off, as I can't fathom what a second outlet on the tee could be used for. The only thing I can think is that it could have been used as a "rodding point" to enable the steam line to be cleaned out using a pipe cleaner of sorts. I cant find any service manual for this exact machine, which might help to explain this, even just by showing a exploded parts view. Its such a shame if I cant get this thing working, as the machine looks brand new inside and out. I'm guessing that the steam element is a bit of a gimmick, and maybe not many have been sold? Any help would be appreciated. 

Edited October 17, 2020 by Downunder