Fan #3 is the LED PCB fan to the back right as you look at the back of the set. You'll have to completely pull the tray out (not hard) and the fan is right there in the open to the right behind fan #2 (the larger fan).
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I don't know which is fan #2 but if you take the back off, you will see one fan right in front of you. The other is harder to get to. It's the black box inside the silver covering with the holes (in left lower part).
My TV was acting up by having only one color showing until I let it cool down then it would work fine. I cut a hole in the plastic back cover and mounted a bigger computer fan. Just spliced it in the wires of the little fan. Fixed the problem
You can attempt to remove the back cover, but there is a very delicate mirror in the back. I'd just move it away from the wall, used compressed air to clean out the fans, and put everything back together. Just make sure you don't damage the color wheel or light engine.
Since the lamp generates a lot of heat, the fans are continuously monitored for correct function. The owner's manual should show you the location of the fans. Make sure that the grills covering the fans are clear of dust and that the fans are clean. Sometimes dirt can cause the fan blades to slow down enough to trigger the safety alert.