Black ink clog in R3000

Recently after running a clean nozzle cycle my black ink nozzles became completely clogged (no ink on nozzle check). Ironic …
Used piezoFlush to clean pads in capping station. How do I gain access to the wiper blade for cleaning?
Anyone have a complete black or other ink clog and successfully fix the issue?

Thanks, Paul

The R3000 wiper blade folds down like the 1400, as shown in our desktop printer maintenance video, here: