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Here are some pic of tired panels in LG plasmas. These are 42V7s, one generation before the 42X3 in your HP set. I've had many 42X3s in the same condition.
One of these was working as found, but likely dumped due to the dots. The other needed a Y-Sustain (which I had on hand) which got the set going again, but it doesn't produce a watchable picture (at least for me, I've seen people tolerate worse). You can see someone watched a lot of FOX sports.
The dots vary with scene content and vary over time. They do seem to get better (but never go away completely) when the set is left on for a while.
There is a degree of adjustment on the Y-sustain board, and sometimes they can be tweaked to produce a better picture; With these two adjusting gave you a choice or bright dots or dark dots - no happy medium.
I have read that the dots can be caused by bad caps on the sustain boards, but I have tried recapping them in the past and it did not improve the picture.
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