Having spun 2-3 hours daily for some 9 years, the case fan is getting rather noisy.  I would like to get a replacement, but I can't get any info from Dell.  Their technical support says they no longer keep replacements in stock.  They won't even give me the part number.  Unfortunately, I have tried to find a number, but it looks as though I need to disassemble it, in order to find out!

Has anyone procured a replacement in the UK lately, what type was it, and where did they get it?  Alternatively, can anyone give me the specifications so I can try and source one?

Much appreciated