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Brown spots on PCB

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I will probably be replacing my feeder motor, so I screwed off the pcb cover to see what the connectors for the steppers look like. I noticed some brown spots on the pcb:



Is this normal? My machine has been on for about 3900 h, and has printed about 2500 h.



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Well I don't consider it normal... but mine looks the same already for a long time so it's probably no problem...


Well, white plastic gets brown with heat. That's normal. But of course one would not see it if the plastic would have a different color. That's maybe one reason why in the past all pcbs were green or brown... ;)

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