That probably it, lots of Plasma sets have been scrapped for duff panels, which is why LCD has taken over (it's far more reliable).
It 'may' be a fault on one of the PCB's that is part of the PDP, but these generally aren't available separately (although some manufacturers are now supplying them). However, Fujitsu have a terrible reputation and in my experience can't even give you a price on the parts, never mind supply any.
Not surprising that Fujitsu are pulling out of the Plasma market in a few weeks time!.