Service agent for HP printers.
We've been given a rather old, but pretty good condition HP 8550 A3 colour Laser printer. It works reasonably well, but it could do with a service. It's making a bit of a raket when it prints, and it jams up every now and then as well. We don't mind paying for a proper service as the printer was given to us, it's worth paying a bit to get it working properly as buying a replacement to do the same job would cost a fair bit.
Can anyone recommend us a good HP service agent who would come to our school and fully service this printer for us? I've never had a printer serviced before, as normally it's not economic to do so, but on this ocassion it just might be worth it.