Plenty of advice comes up in a quick search.
Here's a couple of the many results:
https://www.youtube.com/watch?v=lHyOtoXkWfY
https://www.avsforum.com/forum/167-plasma-flat-panel-displays/1534540-pioneer-kuro-9g-euro-pdp-lx5090-8-blue-blinks-repair.html
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June 2020