I would start by running a Print Calibration, If you are still having the same blotching on the print outs. The drum might need to be replaced.
If you don't have the Manual for doing a print calibration, you can get it here.
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Hi there I'm getting some weird blotches on prints
Can't tell if it's becasue of the paper 80lb/100lb gloss paper
Here's what they look like, also quite uniformed as well
showing up on basically all the colours, more pronounced on the darker ones