Pioneer PDP-5080HD plasma repair

[Kamakiri]

Well, I'm obviously no expert in this realm, but the skill sets to some degree seem to transfer over, and I got this set for free, so what the heck

The set was powering up, but would shut down and the blue light would blink 8 times. An internet search said that the main board was overheating, and needed to be replaced.

Decided to remove the back, and see what was going on, as the cooling fan never seemed to kick on. No bulging caps, nothing obviously wrong, so I powered it up with the back off to see if I could see anything going on. And, of course, I didn't notice the trap switch (a protective switch inside the set to prevent powering up with the back off), so the set locked up.

Managed to get the set into factory reset mode, and saw that the fan status was off. Temp showed about 87 degrees on the board. It's a high hours, set, about 18,000 hours logged on the panel (it's a late 2007 model).

In any event, I got it out of factory mode and began to think that the whole problem was just that the temp sensor was probably bad, or possibly the fan. I took apart an old Dell PC power supply, yanked the fan, and mounted it on top over the main power board. Well what do you know, it worked!!!!

Beautiful picture this thing has too!

I'd like to repair it properly but according to the manual, the temp sensor is on the Tanshi assembly. But by the diagram, it then routes through the main power board. The individual components on the board don't seem to be replaceable.

Has anyone ever worked on one of these, and can anyone offer advice?