HP Printer problems...need help.

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I have some problems with my HP 5550 printer and want to open it. I removed three screws that I could access easily but the top cover will not come off and I can't find and clips to pry loose. Does anyone have any idea how this is removed . Any web site which has such information ?
I can't find a service manual.

I would assume that anyone who can help also has a HP5550 printer.

The problem. A gear seems to be slipping inside and now the printer cartridge appears stuck ( extreme right side ) according to a pop up window on my screen.

Thanks.
 
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