It only does it on heavy paper - and not always. I got to test it, copies were fine. A few min later, it started curling the lead edge corners down (front and rear, sometimes front only) - dog's ears effect.
TEmp/pressure from the fuser and paper is likely hitting something just past the fuser rollers, or before exiting (via finisher). It's hard to stall this to catch the fault, because it sometimes doesn't do it.
Adjustments? There are two screws with springs to the left of the fuser unit - what are they for?
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