"Don't PM Me Bro"
Join Date: Feb 2003
Location: El Segundo, Calif
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It's more likely a foreign object that's between the outer glass and the face of the plasma panel. Through the years there have been random reports of tiny pieces of cardboard trapped between the layers of glass that apparently happened during final assembly. Look at it with a magnifying glass and maybe use a flashlight at angles and see if you can induce a shadow (which would help verify it's something in there and not an actual defect). It could also be something that's trapped under the louver filter coating when it was applied.
Regardless, i'd call Panasonic and report it. A technician will remove the outer glass and determine what it is and take it from there. Hopefully it's something stuck inside that can simply be removed. If he cleans the inside of the glass and/or the face of the panel, make double darn sure that it is streak-free etc before he re-assembles the TV.
Also if you do call for service, leave the TV OFF for several hours before the technician is scheduled to arrive so that the panel is stone cold. Cleaning hot or even warm glass often leaves streaks since the heat dries the liquid before you can wipe it away (BTDT).