Has anyone got a manual on how to take a packard bell MIT-DRAG-D laptop apart?

i need to change the heat sink on the laptop as the fans not working but i cant seem to take it apart correctly ive undone all the screws on the back pane took out the hard drive disk drive e.g but the panel is still connected and i have not missed any screw and the heat sink screws are only accessible from the keyboard side im currently running bye cello taping a case fan to the bottom and connecting it with my DESKTOP and its works fine i just need help changing the heat sink fan!!! thanks :)