When I called the Panasonic Service Center asking for the fix, I could not get them to commit to installing the fix. They asked a lot of the same type of questions-saying all plasmas make noise, can you hear it over the normal sound of the set, etc. One would think if you are calling after owning 4 Panasonic plasma set and having an issue now, they would just say -Yes Sir, sorry to are having a problem,, we do have a fix and schedule the fix.
However, they would only commit to sending out a 3rd party service technician to see if if needed the fix. And would order the fix later and return, If they deemed it necessary. Really? Geez... If they were would ever fix it, my return window would be up waiting for the 2nd return trip to fix-if ever. So I scheduled the set return to cover myself and went to HD and got some foam for DIY. Figured why not try and see.
Well, I guess it worked, I can now hear the panel sligllyt buzzing on some of the slides. And had to shutdown my laptop to really check out the remaining noise. Gladly trade this buzzing noise for the constant warbling fans. I did make a slight engineering adjustment and only partially closed off the left strip of foam on the left fan (facing the back) to allow some of the hot air from the heat sinks on the right to be pulled out too. I ran a temperature check using an IR thermometer and best as I can tell the set is the same or perhaps actually cooler, since the air is now more intelligently routed by the foam. When I made the cardboard vents, I def noticed a hotter running set, so this "fix" does seem to work. And about the same noise reduction. I would say it is about where my VT50 fans noise was - perhaps slightly louder. You can still hear is you listen closely, but I know what to listen. So hard to say, but I doubt most folks would even notice.
I may remove the DIY strips and just see how this plays out with the service center and if the formal fix makes any difference too. Just can't believe they know they have a problem, have a formal fix and still don't want to commit to fix it without two trips when you take the trouble to call for service.