Needs advice on Qty printing R1800

Hi Guys,

After some weeks of busy work load, I've not been printing much photograph with my R1800 but just some written documents, mostly in black.

But last few days found that the quality of photo prints has drop, not too much but instead of the usual warm color I get slight cooler tone. I tested some prints that I've previously printed with the same setting and confirm something is wrong.

So I run some cleaning on the printer and the print out seems ok but I still get a cooler tone other than the usual warm.

Question is after cleaning the printer and print out is ok, is this confirm that the printer is perfectly ok and the problems lies in the software side?

Or please give me some advice on what to do.

Thanks.