Printer partly working Brother (Sundridge)

Hi this printer is temperamental. I have tried cleaning the heads with the process on the display. It works for a bit then stops. It is working with most colours at the moment but not black. It tends to jam if you print double sided. I suspect if someone takes it apart and cleans the heads properly and the wheels inside that move the paper you could probably fix. I need it collected asap please. Sundridge near Sevenoaks. Sorry I cant deliver. Brother business smart mfc-j6530DW