Thank you.
A search for 'paper path' was quite enlightening but at the same time a little worrying as the last mention under 'cleaning page' states that 'this function removes dust and toner from the print paper path' and, of course, my cleaning of the printer didn't remove the speckling.
The 'intermediate transfer belt' that you mention could indeed have some stray toner from the cyan drum, though why this only prints when we print in black I can't understand. Nevertheless, I suppose I could remove all four toner cartridges and have a look underneath.
If I do, and see some stray toner, can you suggest the best way I should go about clearing the toner or perhaps would you advise me to have this done professionally?
I'm not sure how much this would cost, though, and also if there is anyone locally as sending the printer elsewhere might be difficult.
You can wipe the Transfer Belt with a Soft, Dry Cloth.
Have you got a Compressor?