For the default password instead of 1111 please try the serial number of your machine and see if that will get into the admin functions.
Try to clean the Led Print Head (laser windows) with the rod cleaner, to clean the CTD sensors, to be sure to setup correctly the paper type (weight) and to make calibration (under Device tab/Support).
When did this begin happening? Does it happen all the time? Changed any toner cartridges? If so are they the manufacturer or knock-off?
I've seen similar issues on B-405's. After changing the drum the problem went away.
I appear to have discoloured areas on my prints. Almost like a blue patches. If I print multiple copies of the same document these patches are not in the same place. All toner's (with the exception of black) are 50% or over. Drum status according to the printer are all OK. Images are attached for reference. It is almost like fogging in certain areas. Black text etc is all fine.