Local Service Rep returned today, carrying two SD Cards containing firmware updates.
1) Inserting the first of these revealed that it contained an update that was already installed on our Nov Build 60" ST30.
2) The second card looked more promising: it carried an update that had NOT yet been applied to our set.
Purpose (per the Tech): "Change the Scan Board Rate for Updating Pixels."
Info (Presented On Screen): System Update:
PDP Panel 2011 60ST30 (For USA) #ST30 Use Only
PDROM v7541 (32MB)
Tech told me that if they were to replace the Main Board, the new one would already have this update installed.
3) A few minutes after initiating the Update process, it appeared to successfully complete - that is, the TV did NOT "Brick Itself!"
4) Alas, this particular Firmware Update had ZERO Visible Impact on the Pink Tint that afflicts our panel: neither the Service Rep, nor I, could see any difference in the two test scenes we used (which we viewed both Before and After the update).
5) Tech reported "compete failure" to his main office, expressed his regrets at the failure, and told me to expect another call when THEY hear back from Panasonic as to a possible Next Step. (Estimate is "within 72 hours or so"; to their credit, they were MUCH quicker than that after his first visit.)
Guess it is up to Panasonic as to What they will try next, but Tech suggested only thing(s) he could think of would be to "start replacing parts - including possibly the panel itself."