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.
You need to increase your transfer voltage.
Thank you for using the Support Forum. Please take a look at the solutions for light smudges, or smears. If these solutions do not help please consider contacting your support centre for further assistance.
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