My first thought also would have been fuser sleeve and cleaning, sometimes it doesnt even look like a fuser but still is, they were not good on the 4502/5502 models. I will say myself and another tech were going through sleeves a lot due to excessive toner build up around the center of the seperation plate and found you can pretty much just remove the plate and springs and it runs just fine without it and then doesnt scratch the crap out of the fuser sleeve it still doesn't pm most of the time but seems to go a little longer.
Almost any quality issue even when it looks like a drum or xfer belt problem ends up being the fuser, almost every call i get on this model is a fuser rebuild, i carry 3 of them in my stock and I only have maybe 10 of these models in my area but can can go through 2-3 replacements in a day. Overall they are a decent machine get some shading and pcu issues once in a while but really if it wasnt for the fuser I would hardly ever get calls on them.
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